LibGUI+Everywhere: Use fallible Window::set_main_widget() everywhere :^)

Rip that bandaid off!

This does the following, in one big, awkward jump:
- Replace all uses of `set_main_widget<Foo>()` with the `try` version.
- Remove `set_main_widget<Foo>()`.
- Rename the `try` version to just be `set_main_widget` because it's now
  the only one.

The majority of places that call `set_main_widget<Foo>()` are inside
constructors, so this unfortunately gives us a big batch of new
`release_value_but_fixme_should_propagate_errors()` calls.

3 files changed, 10 insertions, 10 deletions

diff --git a/Userland/Applications/FileManager/FileUtils.cpp b/Userland/Applications/FileManager/FileUtils.cpp
index 5a853980e2..468994a515 100644
--- a/Userland/Applications/FileManager/FileUtils.cpp
+++ b/Userland/Applications/FileManager/FileUtils.cpp
@@ -99,7 +99,7 @@ ErrorOr<void> run_file_operation(FileOperation operation, Vector<DeprecatedStrin
     auto pipe_input_file = TRY(Core::Stream::File::adopt_fd(pipe_fds[0], Core::Stream::OpenMode::Read));
     auto buffered_pipe = TRY(Core::Stream::BufferedFile::create(move(pipe_input_file)));
 
-    (void)TRY(window->try_set_main_widget<FileOperationProgressWidget>(operation, move(buffered_pipe), pipe_fds[0]));
+    (void)TRY(window->set_main_widget<FileOperationProgressWidget>(operation, move(buffered_pipe), pipe_fds[0]));
     window->resize(320, 190);
     if (parent_window)
         window->center_within(*parent_window);
diff --git a/Userland/Applications/FileManager/PropertiesWindow.cpp b/Userland/Applications/FileManager/PropertiesWindow.cpp
index 93ed82b47c..146cf99356 100644
--- a/Userland/Applications/FileManager/PropertiesWindow.cpp
+++ b/Userland/Applications/FileManager/PropertiesWindow.cpp
@@ -31,18 +31,18 @@ PropertiesWindow::PropertiesWindow(DeprecatedString const& path, bool disable_re
 {
     auto lexical_path = LexicalPath(path);
 
-    auto& main_widget = set_main_widget<GUI::Widget>();
-    main_widget.set_layout<GUI::VerticalBoxLayout>();
-    main_widget.layout()->set_spacing(6);
-    main_widget.layout()->set_margins(4);
-    main_widget.set_fill_with_background_color(true);
+    auto main_widget = set_main_widget<GUI::Widget>().release_value_but_fixme_should_propagate_errors();
+    main_widget->set_layout<GUI::VerticalBoxLayout>();
+    main_widget->layout()->set_spacing(6);
+    main_widget->layout()->set_margins(4);
+    main_widget->set_fill_with_background_color(true);
 
     set_rect({ 0, 0, 360, 420 });
     set_resizable(false);
 
     set_icon(Gfx::Bitmap::try_load_from_file("/res/icons/16x16/properties.png"sv).release_value_but_fixme_should_propagate_errors());
 
-    auto& tab_widget = main_widget.add<GUI::TabWidget>();
+    auto& tab_widget = main_widget->add<GUI::TabWidget>();
 
     auto& general_tab = tab_widget.add_tab<GUI::Widget>("General");
     general_tab.load_from_gml(properties_window_general_tab_gml);
@@ -142,7 +142,7 @@ PropertiesWindow::PropertiesWindow(DeprecatedString const& path, bool disable_re
     auto others_execute = general_tab.find_descendant_of_type_named<GUI::CheckBox>("others_execute");
     setup_permission_checkboxes(*others_read, *others_write, *others_execute, { S_IROTH, S_IWOTH, S_IXOTH }, m_mode);
 
-    auto& button_widget = main_widget.add<GUI::Widget>();
+    auto& button_widget = main_widget->add<GUI::Widget>();
     button_widget.set_layout<GUI::HorizontalBoxLayout>();
     button_widget.set_fixed_height(22);
     button_widget.layout()->set_spacing(5);
diff --git a/Userland/Applications/FileManager/main.cpp b/Userland/Applications/FileManager/main.cpp
index 6e53198eab..37c5658eaf 100644
--- a/Userland/Applications/FileManager/main.cpp
+++ b/Userland/Applications/FileManager/main.cpp
@@ -351,7 +351,7 @@ ErrorOr<int> run_in_desktop_mode()
     window->set_window_type(GUI::WindowType::Desktop);
     window->set_has_alpha_channel(true);
 
-    auto desktop_widget = TRY(window->try_set_main_widget<FileManager::DesktopWidget>());
+    auto desktop_widget = TRY(window->set_main_widget<FileManager::DesktopWidget>());
     (void)TRY(desktop_widget->try_set_layout<GUI::VerticalBoxLayout>());
 
     auto directory_view = TRY(desktop_widget->try_add<DirectoryView>(DirectoryView::Mode::Desktop));
@@ -579,7 +579,7 @@ ErrorOr<int> run_in_windowed_mode(DeprecatedString const& initial_location, Depr
     auto height = Config::read_i32("FileManager"sv, "Window"sv, "Height"sv, 480);
     auto was_maximized = Config::read_bool("FileManager"sv, "Window"sv, "Maximized"sv, false);
 
-    auto widget = TRY(window->try_set_main_widget<GUI::Widget>());
+    auto widget = TRY(window->set_main_widget<GUI::Widget>());
 
     widget->load_from_gml(file_manager_window_gml);