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.

1 files changed, 6 insertions, 6 deletions

diff --git a/Userland/Libraries/LibGUI/EmojiInputDialog.cpp b/Userland/Libraries/LibGUI/EmojiInputDialog.cpp
index 1cc0dff127..f4d99562d5 100644
--- a/Userland/Libraries/LibGUI/EmojiInputDialog.cpp
+++ b/Userland/Libraries/LibGUI/EmojiInputDialog.cpp
@@ -92,8 +92,8 @@ EmojiInputDialog::EmojiInputDialog(Window* parent_window)
     : Dialog(parent_window)
     , m_category_action_group(make<ActionGroup>())
 {
-    auto& main_widget = set_main_widget<Frame>();
-    if (!main_widget.load_from_gml(emoji_input_dialog_gml))
+    auto main_widget = set_main_widget<Frame>().release_value_but_fixme_should_propagate_errors();
+    if (!main_widget->load_from_gml(emoji_input_dialog_gml))
         VERIFY_NOT_REACHED();
 
     set_window_type(GUI::WindowType::Popup);
@@ -101,10 +101,10 @@ EmojiInputDialog::EmojiInputDialog(Window* parent_window)
     set_blocks_emoji_input(true);
     resize(400, 300);
 
-    auto& scrollable_container = *main_widget.find_descendant_of_type_named<GUI::ScrollableContainerWidget>("scrollable_container"sv);
-    m_search_box = main_widget.find_descendant_of_type_named<GUI::TextBox>("search_box"sv);
-    m_toolbar = main_widget.find_descendant_of_type_named<GUI::Toolbar>("toolbar"sv);
-    m_emojis_widget = main_widget.find_descendant_of_type_named<GUI::Widget>("emojis"sv);
+    auto& scrollable_container = *main_widget->find_descendant_of_type_named<GUI::ScrollableContainerWidget>("scrollable_container"sv);
+    m_search_box = main_widget->find_descendant_of_type_named<GUI::TextBox>("search_box"sv);
+    m_toolbar = main_widget->find_descendant_of_type_named<GUI::Toolbar>("toolbar"sv);
+    m_emojis_widget = main_widget->find_descendant_of_type_named<GUI::Widget>("emojis"sv);
     m_emojis = supported_emoji();
 
     m_category_action_group->set_exclusive(true);