LibGUI+Userland: Improve error and font handling for InputBox

Adds fallible factories, ports DeprecatedString, and rebuilds the
layout to accomodate system font changes.

19 files changed, 134 insertions, 123 deletions

diff --git a/Userland/Applications/Browser/BrowserWindow.cpp b/Userland/Applications/Browser/BrowserWindow.cpp
index 65f4335549..5495256728 100644
--- a/Userland/Applications/Browser/BrowserWindow.cpp
+++ b/Userland/Applications/Browser/BrowserWindow.cpp
@@ -308,11 +308,11 @@ void BrowserWindow::build_menus()
 
     m_change_homepage_action = GUI::Action::create(
         "Set Homepage URL...", g_icon_bag.go_home, [this](auto&) {
-            auto homepage_url = Config::read_string("Browser"sv, "Preferences"sv, "Home"sv, "about:blank"sv);
+            String homepage_url = String::from_deprecated_string(Config::read_string("Browser"sv, "Preferences"sv, "Home"sv, "about:blank"sv)).release_value_but_fixme_should_propagate_errors();
             if (GUI::InputBox::show(this, homepage_url, "Enter URL"sv, "Change homepage URL"sv) == GUI::InputBox::ExecResult::OK) {
                 if (URL(homepage_url).is_valid()) {
                     Config::write_string("Browser"sv, "Preferences"sv, "Home"sv, homepage_url);
-                    Browser::g_home_url = homepage_url;
+                    Browser::g_home_url = homepage_url.to_deprecated_string();
                 } else {
                     GUI::MessageBox::show_error(this, "The URL you have entered is not valid"sv);
                 }
@@ -439,13 +439,13 @@ void BrowserWindow::build_menus()
     add_user_agent("Safari iOS Mobile", "Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0 Mobile/15E148 Safari/604.1");
 
     auto custom_user_agent = GUI::Action::create_checkable("Custom...", [this](auto& action) {
-        DeprecatedString user_agent;
+        String user_agent;
         if (GUI::InputBox::show(this, user_agent, "Enter User Agent:"sv, "Custom User Agent"sv, GUI::InputType::NonemptyText) != GUI::InputBox::ExecResult::OK) {
             m_disable_user_agent_spoofing->activate();
             return;
         }
-        active_tab().view().debug_request("spoof-user-agent", user_agent);
-        action.set_status_tip(user_agent);
+        active_tab().view().debug_request("spoof-user-agent", user_agent.to_deprecated_string());
+        action.set_status_tip(user_agent.to_deprecated_string());
     });
     spoof_user_agent_menu.add_action(custom_user_agent);
     m_user_agent_spoof_actions.add_action(custom_user_agent);
@@ -530,22 +530,22 @@ ErrorOr<void> BrowserWindow::load_search_engines(GUI::Menu& settings_menu)
     }
 
     auto custom_search_engine_action = GUI::Action::create_checkable("Custom...", [&](auto& action) {
-        DeprecatedString search_engine;
+        String search_engine;
         if (GUI::InputBox::show(this, search_engine, "Enter URL template:"sv, "Custom Search Engine"sv, GUI::InputType::NonemptyText, "https://host/search?q={}"sv) != GUI::InputBox::ExecResult::OK) {
             m_disable_search_engine_action->activate();
             return;
         }
 
-        auto argument_count = search_engine.count("{}"sv);
+        auto argument_count = AK::StringUtils::count(search_engine, "{}"sv);
         if (argument_count != 1) {
             GUI::MessageBox::show(this, "Invalid format, must contain '{}' once!"sv, "Error"sv, GUI::MessageBox::Type::Error);
             m_disable_search_engine_action->activate();
             return;
         }
 
-        g_search_engine = search_engine;
+        g_search_engine = search_engine.to_deprecated_string();
         Config::write_string("Browser"sv, "Preferences"sv, "SearchEngine"sv, g_search_engine);
-        action.set_status_tip(search_engine);
+        action.set_status_tip(search_engine.to_deprecated_string());
     });
     search_engine_menu.add_action(custom_search_engine_action);
     m_search_engine_actions.add_action(custom_search_engine_action);
diff --git a/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp b/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
index 435db8e5cf..6ef9631db6 100644
--- a/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
+++ b/Userland/Applications/BrowserSettings/ContentFilterSettingsWidget.cpp
@@ -116,10 +116,10 @@ ContentFilterSettingsWidget::ContentFilterSettingsWidget()
     m_enable_content_filtering_checkbox->on_checked = [&](auto) { set_modified(true); };
 
     m_add_new_domain_button->on_click = [&](unsigned) {
-        DeprecatedString text;
+        String text;
 
         if (GUI::InputBox::show(window(), text, "Enter domain name"sv, "Add domain to Content Filter"sv, GUI::InputType::NonemptyText) == GUI::Dialog::ExecResult::OK) {
-            m_domain_list_model->add_domain(move(text));
+            m_domain_list_model->add_domain(move(text).to_deprecated_string());
             set_modified(true);
         }
     };
diff --git a/Userland/Applications/CharacterMap/CharacterMapWidget.cpp b/Userland/Applications/CharacterMap/CharacterMapWidget.cpp
index fa889e6b43..59c80781ee 100644
--- a/Userland/Applications/CharacterMap/CharacterMapWidget.cpp
+++ b/Userland/Applications/CharacterMap/CharacterMapWidget.cpp
@@ -69,7 +69,7 @@ CharacterMapWidget::CharacterMapWidget()
     m_next_glyph_action->set_status_tip("Seek the next visible glyph");
 
     m_go_to_glyph_action = GUI::Action::create("Go to glyph...", { Mod_Ctrl, Key_G }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-to.png"sv).release_value_but_fixme_should_propagate_errors(), [&](auto&) {
-        DeprecatedString input;
+        String input;
         if (GUI::InputBox::show(window(), input, "Hexadecimal:"sv, "Go to glyph"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
             auto maybe_code_point = AK::StringUtils::convert_to_uint_from_hex(input);
             if (!maybe_code_point.has_value())
diff --git a/Userland/Applications/FileManager/DirectoryView.cpp b/Userland/Applications/FileManager/DirectoryView.cpp
index ddfba640f6..3866f3f84c 100644
--- a/Userland/Applications/FileManager/DirectoryView.cpp
+++ b/Userland/Applications/FileManager/DirectoryView.cpp
@@ -568,7 +568,7 @@ void DirectoryView::handle_selection_change()
 void DirectoryView::setup_actions()
 {
     m_mkdir_action = GUI::Action::create("&New Directory...", { Mod_Ctrl | Mod_Shift, Key_N }, Gfx::Bitmap::load_from_file("/res/icons/16x16/mkdir.png"sv).release_value_but_fixme_should_propagate_errors(), [&](GUI::Action const&) {
-        DeprecatedString value;
+        String value;
         if (GUI::InputBox::show(window(), value, "Enter name:"sv, "New directory"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
             auto new_dir_path = LexicalPath::canonicalized_path(DeprecatedString::formatted("{}/{}", path(), value));
             int rc = mkdir(new_dir_path.characters(), 0777);
@@ -580,7 +580,7 @@ void DirectoryView::setup_actions()
     });
 
     m_touch_action = GUI::Action::create("New &File...", { Mod_Ctrl | Mod_Shift, Key_F }, Gfx::Bitmap::load_from_file("/res/icons/16x16/new.png"sv).release_value_but_fixme_should_propagate_errors(), [&](GUI::Action const&) {
-        DeprecatedString value;
+        String value;
         if (GUI::InputBox::show(window(), value, "Enter name:"sv, "New file"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
             auto new_file_path = LexicalPath::canonicalized_path(DeprecatedString::formatted("{}/{}", path(), value));
             struct stat st;
diff --git a/Userland/Applications/FileManager/main.cpp b/Userland/Applications/FileManager/main.cpp
index 3724bf9d82..d878e6847f 100644
--- a/Userland/Applications/FileManager/main.cpp
+++ b/Userland/Applications/FileManager/main.cpp
@@ -223,7 +223,7 @@ void do_create_link(Vector<DeprecatedString> const& selected_file_paths, GUI::Wi
 
 void do_create_archive(Vector<DeprecatedString> const& selected_file_paths, GUI::Window* window)
 {
-    DeprecatedString archive_name;
+    String archive_name;
     if (GUI::InputBox::show(window, archive_name, "Enter name:"sv, "Create Archive"sv) != GUI::InputBox::ExecResult::OK)
         return;
 
@@ -237,7 +237,7 @@ void do_create_archive(Vector<DeprecatedString> const& selected_file_paths, GUI:
         path_builder.append(".zip"sv);
     } else {
         path_builder.append(archive_name);
-        if (!archive_name.ends_with(".zip"sv))
+        if (!AK::StringUtils::ends_with(archive_name, ".zip"sv, CaseSensitivity::CaseSensitive))
             path_builder.append(".zip"sv);
     }
     auto output_path = path_builder.to_deprecated_string();
diff --git a/Userland/Applications/FontEditor/MainWidget.cpp b/Userland/Applications/FontEditor/MainWidget.cpp
index 9c2ef6fe17..407c7dd294 100644
--- a/Userland/Applications/FontEditor/MainWidget.cpp
+++ b/Userland/Applications/FontEditor/MainWidget.cpp
@@ -242,7 +242,7 @@ ErrorOr<void> MainWidget::create_actions()
     m_show_system_emoji_action->set_status_tip("Show or hide system emoji");
 
     m_go_to_glyph_action = GUI::Action::create("&Go to Glyph...", { Mod_Ctrl, Key_G }, TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/go-to.png"sv)), [&](auto&) {
-        DeprecatedString input;
+        String input;
         if (GUI::InputBox::show(window(), input, "Hexadecimal:"sv, "Go to glyph"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
             auto maybe_code_point = AK::StringUtils::convert_to_uint_from_hex(input);
             if (!maybe_code_point.has_value())
diff --git a/Userland/Applications/HexEditor/HexEditorWidget.cpp b/Userland/Applications/HexEditor/HexEditorWidget.cpp
index 653a355c42..712db290a5 100644
--- a/Userland/Applications/HexEditor/HexEditorWidget.cpp
+++ b/Userland/Applications/HexEditor/HexEditorWidget.cpp
@@ -99,9 +99,9 @@ HexEditorWidget::HexEditorWidget()
     };
 
     m_new_action = GUI::Action::create("New", { Mod_Ctrl, Key_N }, Gfx::Bitmap::load_from_file("/res/icons/16x16/new.png"sv).release_value_but_fixme_should_propagate_errors(), [this](const GUI::Action&) {
-        DeprecatedString value;
+        String value;
         if (request_close() && GUI::InputBox::show(window(), value, "Enter new file size:"sv, "New file size"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
-            auto file_size = value.to_uint();
+            auto file_size = AK::StringUtils::convert_to_uint(value);
             if (!file_size.has_value()) {
                 GUI::MessageBox::show(window(), "Invalid file size entered."sv, "Error"sv, GUI::MessageBox::Type::Error);
                 return;
@@ -242,9 +242,9 @@ HexEditorWidget::HexEditorWidget()
     m_copy_as_c_code_action->set_enabled(false);
 
     m_fill_selection_action = GUI::Action::create("Fill &Selection...", { Mod_Ctrl, Key_B }, [&](const GUI::Action&) {
-        DeprecatedString value;
+        String value;
         if (GUI::InputBox::show(window(), value, "Fill byte (hex):"sv, "Fill Selection"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
-            auto fill_byte = strtol(value.characters(), nullptr, 16);
+            auto fill_byte = strtol(value.bytes_as_string_view().characters_without_null_termination(), nullptr, 16);
             auto result = m_editor->fill_selection(fill_byte);
             if (result.is_error())
                 GUI::MessageBox::show_error(window(), DeprecatedString::formatted("{}", result.error()));
diff --git a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
index 849494b414..a830081c26 100644
--- a/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
+++ b/Userland/Applications/KeyboardMapper/KeyboardMapperWidget.cpp
@@ -55,7 +55,7 @@ void KeyboardMapperWidget::create_frame()
         tmp_button.set_enabled(keys[i].enabled);
 
         tmp_button.on_click = [this, &tmp_button]() {
-            DeprecatedString value;
+            String value;
             if (GUI::InputBox::show(window(), value, "New Character:"sv, "Select Character"sv) == GUI::InputBox::ExecResult::OK) {
                 int i = m_keys.find_first_index(&tmp_button).value_or(0);
                 VERIFY(i > 0);
@@ -63,13 +63,13 @@ void KeyboardMapperWidget::create_frame()
                 auto index = keys[i].map_index;
                 VERIFY(index > 0);
 
-                tmp_button.set_text(String::from_deprecated_string(value).release_value_but_fixme_should_propagate_errors());
+                tmp_button.set_text(value);
                 u32* map = map_from_name(m_current_map_name);
 
-                if (value.length() == 0)
+                if (value.is_empty())
                     map[index] = '\0'; // Empty string
                 else
-                    map[index] = value[0];
+                    map[index] = value.bytes().at(0);
 
                 window()->set_modified(true);
             }
diff --git a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
index 3a11e3c32a..b5a316121e 100644
--- a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
@@ -373,7 +373,7 @@ PDF::PDFErrorOr<void> PDFViewerWidget::try_open_file(StringView path, NonnullOwn
     auto document = TRY(PDF::Document::create(m_buffer));
 
     if (auto sh = document->security_handler(); sh && !sh->has_user_password()) {
-        DeprecatedString password;
+        String password;
         while (true) {
             auto result = GUI::InputBox::show(window(), password, "Password"sv, "Password required"sv, GUI::InputType::Password);
             if (result == GUI::Dialog::ExecResult::OK
diff --git a/Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp b/Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp
index 897ccb2037..c8ca139905 100644
--- a/Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp
+++ b/Userland/Applications/Spreadsheet/SpreadsheetWidget.cpp
@@ -100,16 +100,16 @@ SpreadsheetWidget::SpreadsheetWidget(GUI::Window& parent_window, Vector<NonnullR
         auto* sheet_ptr = m_tab_context_menu_sheet_view->sheet_if_available();
         VERIFY(sheet_ptr); // How did we get here without a sheet?
         auto& sheet = *sheet_ptr;
-        DeprecatedString new_name;
+        String new_name;
         if (GUI::InputBox::show(window(), new_name, DeprecatedString::formatted("New name for '{}'", sheet.name()), "Rename sheet"sv) == GUI::Dialog::ExecResult::OK) {
             sheet.set_name(new_name);
             sheet.update();
-            m_tab_widget->set_tab_title(static_cast<GUI::Widget&>(*m_tab_context_menu_sheet_view), String::from_deprecated_string(new_name).release_value_but_fixme_should_propagate_errors());
+            m_tab_widget->set_tab_title(static_cast<GUI::Widget&>(*m_tab_context_menu_sheet_view), new_name);
         }
     });
     m_tab_context_menu->add_action(*m_rename_action);
     m_tab_context_menu->add_action(GUI::Action::create("Add new sheet...", Gfx::Bitmap::load_from_file("/res/icons/16x16/new-tab.png"sv).release_value_but_fixme_should_propagate_errors(), [this](auto&) {
-        DeprecatedString name;
+        String name;
         if (GUI::InputBox::show(window(), name, "Name for new sheet"sv, "Create sheet"sv) == GUI::Dialog::ExecResult::OK) {
             Vector<NonnullRefPtr<Sheet>> new_sheets;
             new_sheets.append(m_workbook->add_sheet(name));
diff --git a/Userland/Demos/WidgetGallery/GalleryWidget.cpp b/Userland/Demos/WidgetGallery/GalleryWidget.cpp
index 9109950d63..4107b9db52 100644
--- a/Userland/Demos/WidgetGallery/GalleryWidget.cpp
+++ b/Userland/Demos/WidgetGallery/GalleryWidget.cpp
@@ -118,7 +118,7 @@ GalleryWidget::GalleryWidget()
     m_input_button->set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/properties.png"sv).release_value_but_fixme_should_propagate_errors());
 
     m_input_button->on_click = [&](auto) {
-        DeprecatedString value;
+        String value;
         if (GUI::InputBox::show(window(), value, "Enter input:"sv, "Input"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK)
             m_text_editor->set_text(value);
     };
diff --git a/Userland/DevTools/HackStudio/Debugger/DebugInfoWidget.cpp b/Userland/DevTools/HackStudio/Debugger/DebugInfoWidget.cpp
index 7c615635d0..c4ff1ebe16 100644
--- a/Userland/DevTools/HackStudio/Debugger/DebugInfoWidget.cpp
+++ b/Userland/DevTools/HackStudio/Debugger/DebugInfoWidget.cpp
@@ -121,7 +121,7 @@ RefPtr<GUI::Menu> DebugInfoWidget::get_context_menu_for_variable(const GUI::Mode
     auto* variable = static_cast<Debug::DebugInfo::VariableInfo const*>(index.internal_data());
     if (does_variable_support_writing(variable)) {
         context_menu->add_action(GUI::Action::create("Change value", [&](auto&) {
-            DeprecatedString value;
+            String value;
             if (GUI::InputBox::show(window(), value, "Enter new value:"sv, "Set variable value"sv) == GUI::InputBox::ExecResult::OK) {
                 auto& model = static_cast<VariablesModel&>(*m_variables_view->model());
                 model.set_variable_value(index, value, window());
diff --git a/Userland/DevTools/HackStudio/HackStudioWidget.cpp b/Userland/DevTools/HackStudio/HackStudioWidget.cpp
index a46350dbe4..6d6cceaa25 100644
--- a/Userland/DevTools/HackStudio/HackStudioWidget.cpp
+++ b/Userland/DevTools/HackStudio/HackStudioWidget.cpp
@@ -522,12 +522,12 @@ ErrorOr<NonnullRefPtr<GUI::Action>> HackStudioWidget::create_new_file_action(Dep
 {
     auto icon_no_shadow = TRY(Gfx::Bitmap::load_from_file(icon));
     return GUI::Action::create(label, icon_no_shadow, [this, extension](const GUI::Action&) {
-        DeprecatedString filename;
+        String filename;
         if (GUI::InputBox::show(window(), filename, "Enter name of new file:"sv, "Add new file to project"sv) != GUI::InputBox::ExecResult::OK)
             return;
 
-        if (!extension.is_empty() && !filename.ends_with(DeprecatedString::formatted(".{}", extension))) {
-            filename = DeprecatedString::formatted("{}.{}", filename, extension);
+        if (!extension.is_empty() && !AK::StringUtils::ends_with(filename, DeprecatedString::formatted(".{}", extension), CaseSensitivity::CaseSensitive)) {
+            filename = String::formatted("{}.{}", filename, extension).release_value_but_fixme_should_propagate_errors();
         }
 
         auto path_to_selected = selected_file_paths();
@@ -564,7 +564,7 @@ ErrorOr<NonnullRefPtr<GUI::Action>> HackStudioWidget::create_new_directory_actio
 {
     auto icon = TRY(Gfx::Bitmap::load_from_file("/res/icons/16x16/mkdir.png"sv));
     return GUI::Action::create("&Directory...", { Mod_Ctrl | Mod_Shift, Key_N }, icon, [this](const GUI::Action&) {
-        DeprecatedString directory_name;
+        String directory_name;
         if (GUI::InputBox::show(window(), directory_name, "Enter name of new directory:"sv, "Add new folder to project"sv) != GUI::InputBox::ExecResult::OK)
             return;
 
@@ -580,7 +580,7 @@ ErrorOr<NonnullRefPtr<GUI::Action>> HackStudioWidget::create_new_directory_actio
             else
                 dir_path = selected.dirname();
 
-            directory_name = DeprecatedString::formatted("{}/{}", dir_path, directory_name);
+            directory_name = String::formatted("{}/{}", dir_path, directory_name).release_value_but_fixme_should_propagate_errors();
         }
 
         auto formatted_dir_name = LexicalPath::canonicalized_path(DeprecatedString::formatted("{}/{}", m_project->model().root_path(), directory_name));
diff --git a/Userland/Games/MasterWord/main.cpp b/Userland/Games/MasterWord/main.cpp
index c5c9dde320..ef1515267b 100644
--- a/Userland/Games/MasterWord/main.cpp
+++ b/Userland/Games/MasterWord/main.cpp
@@ -75,9 +75,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     TRY(settings_menu->try_add_action(GUI::Action::create("Set &Word Length", [&](auto&) {
         auto word_length = Config::read_i32("MasterWord"sv, ""sv, "word_length"sv, 5);
-        auto word_length_string = DeprecatedString::number(word_length);
+        auto word_length_string = String::number(word_length).release_value_but_fixme_should_propagate_errors();
         if (GUI::InputBox::show(window, word_length_string, "Word length:"sv, "MasterWord"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
-            auto maybe_word_length = word_length_string.template to_uint();
+            auto maybe_word_length = AK::StringUtils::convert_to_uint(word_length_string);
             if (!maybe_word_length.has_value() || maybe_word_length.value() < shortest_word || maybe_word_length.value() > longest_word) {
                 GUI::MessageBox::show(window, DeprecatedString::formatted("Please enter a number between {} and {}.", shortest_word, longest_word), "MasterWord"sv);
                 return;
@@ -90,9 +90,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     })));
     TRY(settings_menu->try_add_action(GUI::Action::create("Set &Number Of Guesses", [&](auto&) {
         auto max_guesses = Config::read_i32("MasterWord"sv, ""sv, "max_guesses"sv, 5);
-        auto max_guesses_string = DeprecatedString::number(max_guesses);
+        auto max_guesses_string = String::number(max_guesses).release_value_but_fixme_should_propagate_errors();
         if (GUI::InputBox::show(window, max_guesses_string, "Maximum number of guesses:"sv, "MasterWord"sv, GUI::InputType::NonemptyText) == GUI::InputBox::ExecResult::OK) {
-            auto maybe_max_guesses = max_guesses_string.template to_uint();
+            auto maybe_max_guesses = AK::StringUtils::convert_to_uint(max_guesses_string);
             if (!maybe_max_guesses.has_value() || maybe_max_guesses.value() < 1 || maybe_max_guesses.value() > 20) {
                 GUI::MessageBox::show(window, "Please enter a number between 1 and 20."sv, "MasterWord"sv);
                 return;
diff --git a/Userland/Libraries/LibGUI/FilePicker.cpp b/Userland/Libraries/LibGUI/FilePicker.cpp
index dced842f09..fbef90de65 100644
--- a/Userland/Libraries/LibGUI/FilePicker.cpp
+++ b/Userland/Libraries/LibGUI/FilePicker.cpp
@@ -163,7 +163,7 @@ FilePicker::FilePicker(Window* parent_window, Mode mode, StringView filename, St
 
     auto mkdir_action = Action::create(
         "New directory...", { Mod_Ctrl | Mod_Shift, Key_N }, Gfx::Bitmap::load_from_file("/res/icons/16x16/mkdir.png"sv).release_value_but_fixme_should_propagate_errors(), [this](Action const&) {
-            DeprecatedString value;
+            String value;
             if (InputBox::show(this, value, "Enter name:"sv, "New directory"sv, GUI::InputType::NonemptyText) == InputBox::ExecResult::OK) {
                 auto new_dir_path = LexicalPath::canonicalized_path(DeprecatedString::formatted("{}/{}", m_model->root_path(), value));
                 int rc = mkdir(new_dir_path.characters(), 0777);
diff --git a/Userland/Libraries/LibGUI/InputBox.cpp b/Userland/Libraries/LibGUI/InputBox.cpp
index 5c590d821a..85e5e93353 100644
--- a/Userland/Libraries/LibGUI/InputBox.cpp
+++ b/Userland/Libraries/LibGUI/InputBox.cpp
@@ -11,116 +11,119 @@
 #include <LibGUI/InputBox.h>
 #include <LibGUI/Label.h>
 #include <LibGUI/TextBox.h>
-#include <LibGfx/Font/Font.h>
 
 namespace GUI {
 
-InputBox::InputBox(Window* parent_window, DeprecatedString text_value, StringView prompt, StringView title, InputType input_type, StringView placeholder)
+ErrorOr<NonnullRefPtr<InputBox>> InputBox::create(Window* parent_window, String text_value, StringView prompt, StringView title, InputType input_type)
+{
+    auto box = TRY(adopt_nonnull_ref_or_enomem(new (nothrow) InputBox(parent_window, text_value, TRY(String::from_utf8(title)), TRY(String::from_utf8(prompt)), input_type)));
+    TRY(box->build());
+    return box;
+}
+
+InputBox::InputBox(Window* parent_window, String text_value, String title, String prompt, InputType input_type)
     : Dialog(parent_window)
     , m_text_value(move(text_value))
-    , m_prompt(prompt)
+    , m_prompt(move(prompt))
     , m_input_type(input_type)
-    , m_placeholder(placeholder)
 {
-    set_title(title);
-    build();
+    set_title(move(title).to_deprecated_string());
+    set_resizable(false);
+    set_auto_shrink(true);
+}
+
+Dialog::ExecResult InputBox::show(Window* parent_window, String& text_value, StringView prompt, StringView title, InputType input_type, StringView placeholder)
+{
+    return MUST(try_show(parent_window, text_value, prompt, title, input_type, placeholder));
 }
 
-Dialog::ExecResult InputBox::show(Window* parent_window, DeprecatedString& text_value, StringView prompt, StringView title, InputType input_type, StringView placeholder)
+ErrorOr<Dialog::ExecResult> InputBox::try_show(Window* parent_window, String& text_value, StringView prompt, StringView title, InputType input_type, StringView placeholder)
 {
-    auto box = InputBox::construct(parent_window, text_value, prompt, title, input_type, placeholder);
-    box->set_resizable(false);
+    auto box = TRY(InputBox::create(parent_window, text_value, prompt, title, input_type));
     if (parent_window)
         box->set_icon(parent_window->icon());
+    box->set_placeholder(placeholder);
     auto result = box->exec();
     text_value = box->text_value();
     return result;
 }
 
-void InputBox::set_text_value(DeprecatedString text_value)
+void InputBox::set_placeholder(StringView view)
 {
-    m_text_editor->set_text(move(text_value));
+    m_text_editor->set_placeholder(view);
+}
+
+void InputBox::set_text_value(String value)
+{
+    if (m_text_value == value)
+        return;
+    m_text_value = move(value);
+    m_text_editor->set_text(m_text_value);
 }
 
 void InputBox::on_done(ExecResult result)
 {
-    if (result == ExecResult::OK) {
-        m_text_value = m_text_editor->text();
-
-        switch (m_input_type) {
-        case InputType::Text:
-        case InputType::Password:
-            break;
-
-        case InputType::NonemptyText:
-            VERIFY(!m_text_value.is_empty());
-            break;
-        }
+    if (result != ExecResult::OK)
+        return;
+
+    if (auto value = String::from_deprecated_string(m_text_editor->text()); !value.is_error())
+        m_text_value = value.release_value();
+
+    switch (m_input_type) {
+    case InputType::Text:
+    case InputType::Password:
+        break;
+
+    case InputType::NonemptyText:
+        VERIFY(!m_text_value.is_empty());
+        break;
     }
 }
 
-void InputBox::build()
+ErrorOr<void> InputBox::build()
 {
-    auto widget = set_main_widget<Widget>().release_value_but_fixme_should_propagate_errors();
+    auto main_widget = TRY(set_main_widget<Widget>());
+    TRY(main_widget->try_set_layout<VerticalBoxLayout>(4, 6));
+    main_widget->set_fill_with_background_color(true);
 
-    int text_width = widget->font().width(m_prompt);
-    int title_width = widget->font().width(title()) + 24 /* icon, plus a little padding -- not perfect */;
-    int max_width = max(text_width, title_width);
+    auto input_container = TRY(main_widget->try_add<Widget>());
+    input_container->set_layout<HorizontalBoxLayout>();
 
-    widget->set_layout<VerticalBoxLayout>(6, 6);
-    widget->set_fill_with_background_color(true);
-    widget->set_preferred_height(SpecialDimension::Fit);
+    m_prompt_label = TRY(input_container->try_add<Label>());
+    m_prompt_label->set_autosize(true);
+    m_prompt_label->set_text(move(m_prompt).to_deprecated_string());
 
-    auto& label_editor_container = widget->add<Widget>();
-    label_editor_container.set_layout<HorizontalBoxLayout>();
-    label_editor_container.set_preferred_height(SpecialDimension::Fit);
-
-    auto& label = label_editor_container.add<Label>(m_prompt);
-    label.set_preferred_width(text_width);
+    TRY(input_container->add_spacer());
 
     switch (m_input_type) {
     case InputType::Text:
     case InputType::NonemptyText:
-        m_text_editor = label_editor_container.add<TextBox>();
+        m_text_editor = TRY(input_container->try_add<TextBox>());
         break;
     case InputType::Password:
-        m_text_editor = label_editor_container.add<PasswordBox>();
+        m_text_editor = TRY(input_container->try_add<PasswordBox>());
         break;
     }
 
-    m_text_editor->set_text(m_text_value);
-
-    if (!m_placeholder.is_null())
-        m_text_editor->set_placeholder(m_placeholder);
+    auto button_container = TRY(main_widget->try_add<Widget>());
+    TRY(button_container->try_set_layout<HorizontalBoxLayout>(0, 6));
+    TRY(button_container->add_spacer());
 
-    auto& button_container_outer = widget->add<Widget>();
-    button_container_outer.set_preferred_height(SpecialDimension::Fit);
-    button_container_outer.set_layout<VerticalBoxLayout>();
-
-    auto& button_container_inner = button_container_outer.add<Widget>();
-    button_container_inner.set_layout<HorizontalBoxLayout>(GUI::Margins {}, 6);
-    button_container_inner.set_preferred_height(SpecialDimension::Fit);
-    button_container_inner.add_spacer().release_value_but_fixme_should_propagate_errors();
-
-    m_ok_button = button_container_inner.add<DialogButton>();
-    m_ok_button->set_text("OK"_short_string);
-    m_ok_button->on_click = [this](auto) {
-        dbgln("GUI::InputBox: OK button clicked");
-        done(ExecResult::OK);
-    };
+    m_ok_button = TRY(button_container->try_add<DialogButton>("OK"_short_string));
+    m_ok_button->on_click = [this](auto) { done(ExecResult::OK); };
     m_ok_button->set_default(true);
 
-    m_cancel_button = button_container_inner.add<DialogButton>();
-    m_cancel_button->set_text("Cancel"_short_string);
-    m_cancel_button->on_click = [this](auto) {
-        dbgln("GUI::InputBox: Cancel button clicked");
-        done(ExecResult::Cancel);
-    };
+    m_cancel_button = TRY(button_container->try_add<DialogButton>("Cancel"_short_string));
+    m_cancel_button->on_click = [this](auto) { done(ExecResult::Cancel); };
 
-    m_text_editor->on_escape_pressed = [this] {
-        m_cancel_button->click();
+    auto resize_editor = [this, button_container] {
+        auto width = button_container->effective_min_size().width().as_int();
+        m_text_editor->set_min_width(width);
     };
-    m_text_editor->set_focus(true);
+    resize_editor();
+    on_font_change = [resize_editor] { resize_editor(); };
+
+    m_text_editor->set_text(m_text_value);
 
     if (m_input_type == InputType::NonemptyText) {
         m_text_editor->on_change = [this] {
@@ -129,7 +132,10 @@ void InputBox::build()
         m_text_editor->on_change();
     }
 
-    set_rect(x(), y(), max_width + 140, widget->effective_preferred_size().height().as_int());
+    auto size = main_widget->effective_min_size();
+    resize(TRY(size.width().shrink_value()), TRY(size.height().shrink_value()));
+
+    return {};
 }
 
 }
diff --git a/Userland/Libraries/LibGUI/InputBox.h b/Userland/Libraries/LibGUI/InputBox.h
index 9ca6a6c84a..a1c5017516 100644
--- a/Userland/Libraries/LibGUI/InputBox.h
+++ b/Userland/Libraries/LibGUI/InputBox.h
@@ -19,29 +19,33 @@ enum class InputType {
 };
 
 class InputBox : public Dialog {
-    C_OBJECT(InputBox)
+    C_OBJECT_ABSTRACT(InputBox)
 public:
     virtual ~InputBox() override = default;
 
-    static ExecResult show(Window* parent_window, DeprecatedString& text_value, StringView prompt, StringView title, InputType input_type = InputType::Text, StringView placeholder = {});
+    static ExecResult show(Window* parent_window, String& text_value, StringView prompt, StringView title, InputType input_type = InputType::Text, StringView placeholder = {});
+    static ErrorOr<ExecResult> try_show(Window* parent_window, String& text_value, StringView prompt, StringView title, InputType input_type = InputType::Text, StringView placeholder = {});
+    static ErrorOr<NonnullRefPtr<InputBox>> create(Window* parent_window, String text_value, StringView prompt, StringView title, InputType input_type);
 
-    DeprecatedString const& text_value() const { return m_text_value; }
-    void set_text_value(DeprecatedString text_value);
+    String const& text_value() const { return m_text_value; }
+    void set_text_value(String);
+
+    void set_placeholder(StringView);
 
 private:
-    explicit InputBox(Window* parent_window, DeprecatedString text_value, StringView prompt, StringView title, InputType input_type, StringView placeholder);
+    InputBox(Window* parent_window, String text_value, String title, String prompt, InputType input_type);
 
     virtual void on_done(ExecResult) override;
-    void build();
+    ErrorOr<void> build();
 
-    DeprecatedString m_text_value;
-    DeprecatedString m_prompt;
+    String m_text_value;
+    String m_prompt;
     InputType m_input_type;
-    DeprecatedString m_placeholder;
 
     RefPtr<Button> m_ok_button;
     RefPtr<Button> m_cancel_button;
     RefPtr<TextEditor> m_text_editor;
+    RefPtr<Label> m_prompt_label;
 };
 
 }
diff --git a/Userland/Libraries/LibGUI/TextEditor.cpp b/Userland/Libraries/LibGUI/TextEditor.cpp
index 0981534a44..77602ad05b 100644
--- a/Userland/Libraries/LibGUI/TextEditor.cpp
+++ b/Userland/Libraries/LibGUI/TextEditor.cpp
@@ -97,9 +97,9 @@ void TextEditor::create_actions()
     if (is_multi_line()) {
         m_go_to_line_action = Action::create(
             "Go to line...", { Mod_Ctrl, Key_L }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-to.png"sv).release_value_but_fixme_should_propagate_errors(), [this](auto&) {
-                DeprecatedString value;
+                String value;
                 if (InputBox::show(window(), value, "Line:"sv, "Go to line"sv) == InputBox::ExecResult::OK) {
-                    auto line_target = value.to_uint();
+                    auto line_target = AK::StringUtils::convert_to_uint(value.bytes_as_string_view());
                     if (line_target.has_value()) {
                         set_cursor_and_focus_line(line_target.value() - 1, 0);
                     }
diff --git a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
index 5e9f57de6b..e6505acdd6 100644
--- a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
+++ b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
@@ -371,12 +371,13 @@ void OutOfProcessWebView::notify_server_did_request_confirm(Badge<WebContentClie
 
 void OutOfProcessWebView::notify_server_did_request_prompt(Badge<WebContentClient>, String const& message, String const& default_)
 {
-    m_dialog = GUI::InputBox::construct(window(), default_.to_deprecated_string(), message, "Prompt"sv, GUI::InputType::Text, StringView {});
+    String mutable_value = default_;
+    m_dialog = GUI::InputBox::create(window(), mutable_value, message, "Prompt"sv, GUI::InputType::Text).release_value_but_fixme_should_propagate_errors();
     m_dialog->set_icon(window()->icon());
 
     if (m_dialog->exec() == GUI::InputBox::ExecResult::OK) {
         auto const& dialog = static_cast<GUI::InputBox const&>(*m_dialog);
-        auto response = String::from_deprecated_string(dialog.text_value()).release_value_but_fixme_should_propagate_errors();
+        auto response = dialog.text_value();
 
         client().async_prompt_closed(move(response));
     } else {
@@ -389,7 +390,7 @@ void OutOfProcessWebView::notify_server_did_request_prompt(Badge<WebContentClien
 void OutOfProcessWebView::notify_server_did_request_set_prompt_text(Badge<WebContentClient>, String const& message)
 {
     if (m_dialog && is<GUI::InputBox>(*m_dialog))
-        static_cast<GUI::InputBox&>(*m_dialog).set_text_value(message.to_deprecated_string());
+        static_cast<GUI::InputBox&>(*m_dialog).set_text_value(message);
 }
 
 void OutOfProcessWebView::notify_server_did_request_accept_dialog(Badge<WebContentClient>)