LibGUI: Get rid of GWindow::should_exit_event_loop_on_close().

This behavior and API was extremely counter-intuitive since our default
behavior was for applications to never exit after you close all of their
windows.

Now that we exit the event loop by default when the very last GWindow is
deleted, we don't have to worry about this.

Applications/About/main.cpp

@@ -16,7 +16,6 @@ int main(int argc, char** argv)
     window_rect.center_within(GDesktop::the().rect());
     window->set_resizable(false);
     window->set_rect(window_rect);
-    window->set_should_exit_event_loop_on_close(true);
 
     auto* widget = new GWidget;
     window->set_main_widget(widget);

Applications/FileManager/main.cpp

@@ -39,7 +39,6 @@ int main(int argc, char** argv)
     auto* window = new GWindow;
     window->set_title("File Manager");
     window->set_rect(20, 200, 640, 480);
-    window->set_should_exit_event_loop_on_close(true);
 
     auto* widget = new GWidget;
     widget->set_layout(make<GBoxLayout>(Orientation::Vertical));

Applications/FontEditor/main.cpp

@@ -29,7 +29,6 @@ int main(int argc, char** argv)
     window->set_rect({ 50, 50, 390, 342 });
     auto* font_editor = new FontEditorWidget(path, move(edited_font));
     window->set_main_widget(font_editor);
-    window->set_should_exit_event_loop_on_close(true);
     window->show();
     window->set_icon_path("/res/icons/16x16/app-font-editor.png");
     return app.exec();

Applications/IRCClient/main.cpp

@@ -8,7 +8,6 @@ int main(int argc, char** argv)
     GApplication app(argc, argv);
 
     IRCAppWindow app_window;
-    app_window.set_should_exit_event_loop_on_close(true);
     app_window.show();
 
     printf("Entering main loop...\n");

Applications/Launcher/main.cpp

@@ -30,7 +30,6 @@ int main(int argc, char** argv)
     signal(SIGCHLD, handle_sigchld);
 
     auto* launcher_window = make_launcher_window();
-    launcher_window->set_should_exit_event_loop_on_close(true);
     launcher_window->show();
 
     return app.exec();

Applications/PaintBrush/main.cpp

@@ -18,7 +18,6 @@ int main(int argc, char** argv)
     auto* window = new GWindow;
     window->set_title("PaintBrush");
     window->set_rect(100, 100, 640, 480);
-    window->set_should_exit_event_loop_on_close(true);
 
     auto* horizontal_container = new GWidget(nullptr);
     window->set_main_widget(horizontal_container);

Applications/Piano/main.cpp

@@ -16,7 +16,6 @@ int main(int argc, char** argv)
     auto* window = new GWindow;
     window->set_title("Piano");
     window->set_rect(100, 100, 512, 512);
-    window->set_should_exit_event_loop_on_close(true);
 
     auto* piano_widget = new PianoWidget;
     window->set_main_widget(piano_widget);

Applications/ProcessManager/main.cpp

@@ -153,7 +153,7 @@ int main(int argc, char** argv)
     window->set_title("Process Manager");
     window->set_rect(20, 200, 680, 400);
     window->set_main_widget(keeper);
-    window->set_should_exit_event_loop_on_close(true);
+
     window->show();
 
     window->set_icon_path("/res/icons/16x16/app-process-manager.png");

Applications/QuickShow/main.cpp

@@ -1,4 +1,5 @@
 #include "QSWidget.h"
+#include <LibDraw/PNGLoader.h>
 #include <LibGUI/GAction.h>
 #include <LibGUI/GApplication.h>
 #include <LibGUI/GBoxLayout.h>
@@ -6,7 +7,6 @@
 #include <LibGUI/GMenu.h>
 #include <LibGUI/GMenuBar.h>
 #include <LibGUI/GWindow.h>
-#include <LibDraw/PNGLoader.h>
 #include <stdio.h>
 
 int main(int argc, char** argv)
@@ -67,7 +67,6 @@ int main(int argc, char** argv)
     widget->set_bitmap(*bitmap);
     window->set_main_widget(widget);
 
-    window->set_should_exit_event_loop_on_close(true);
     window->show();
 
     return app.exec();

Applications/Taskbar/TaskbarWindow.cpp

@@ -15,7 +15,6 @@ TaskbarWindow::TaskbarWindow()
 {
     set_window_type(GWindowType::Taskbar);
     set_title("Taskbar");
-    set_should_exit_event_loop_on_close(true);
 
     on_screen_rect_change(GDesktop::the().rect());
 

Applications/Terminal/main.cpp

@@ -146,7 +146,6 @@ int main(int argc, char** argv)
     window->set_title("Terminal");
     window->set_background_color(Color::Black);
     window->set_double_buffering_enabled(false);
-    window->set_should_exit_event_loop_on_close(true);
 
     RefPtr<CConfigFile> config = CConfigFile::get_for_app("Terminal");
     Terminal terminal(ptm_fd, config);

Applications/TextEditor/main.cpp

@@ -7,7 +7,6 @@ int main(int argc, char** argv)
     auto* window = new GWindow;
     window->set_title("Text Editor");
     window->set_rect(20, 200, 640, 400);
-    window->set_should_exit_event_loop_on_close(true);
 
     auto* text_widget = new TextEditorWidget();
     window->set_main_widget(text_widget);

Demos/Fire/Fire.cpp

@@ -16,12 +16,12 @@
  *  [ ] handle fire bitmap edges better
 */
 
+#include <LibDraw/GraphicsBitmap.h>
 #include <LibGUI/GApplication.h>
 #include <LibGUI/GLabel.h>
 #include <LibGUI/GPainter.h>
 #include <LibGUI/GWidget.h>
 #include <LibGUI/GWindow.h>
-#include <LibDraw/GraphicsBitmap.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <time.h>
@@ -214,7 +214,6 @@ int main(int argc, char** argv)
     GApplication app(argc, argv);
 
     auto* window = new GWindow;
-    window->set_should_exit_event_loop_on_close(true);
     window->set_double_buffering_enabled(false);
     window->set_title("Fire");
     window->set_resizable(false);

DevTools/VisualBuilder/main.cpp

@@ -60,7 +60,7 @@ int main(int argc, char** argv)
     window->set_title(form1->name());
     window->set_rect(120, 200, 640, 400);
     window->set_main_widget(form1);
-    window->set_should_exit_event_loop_on_close(true);
+
     window->show();
 
     auto* toolbox = make_toolbox_window();

Games/Minesweeper/main.cpp

@@ -14,7 +14,6 @@ int main(int argc, char** argv)
     GApplication app(argc, argv);
 
     auto* window = new GWindow;
-    window->set_should_exit_event_loop_on_close(true);
     window->set_resizable(false);
     window->set_title("Minesweeper");
     window->set_rect(100, 100, 139, 175);

Games/Snake/main.cpp

@@ -12,7 +12,7 @@ int main(int argc, char** argv)
     GApplication app(argc, argv);
 
     auto* window = new GWindow;
-    window->set_should_exit_event_loop_on_close(true);
+
     window->set_double_buffering_enabled(false);
     window->set_title("Snake");
     window->set_rect(100, 100, 320, 320);

Libraries/LibGUI/GDialog.cpp

@@ -6,7 +6,7 @@ GDialog::GDialog(CObject* parent)
     : GWindow(parent)
 {
     set_modal(true);
-    set_should_exit_event_loop_on_close(true);
+
 }
 
 GDialog::~GDialog()

Libraries/LibGUI/GWindow.cpp

@@ -46,8 +46,6 @@ GWindow::~GWindow()
 
 void GWindow::close()
 {
-    if (should_exit_event_loop_on_close())
-        GEventLoop::current().quit(0);
     if (should_destroy_on_close())
         delete_later();
 }

Libraries/LibGUI/GWindow.h

@@ -104,9 +104,6 @@ public:
     GWidget* automatic_cursor_tracking_widget() { return m_automatic_cursor_tracking_widget.ptr(); }
     const GWidget* automatic_cursor_tracking_widget() const { return m_automatic_cursor_tracking_widget.ptr(); }
 
-    bool should_exit_event_loop_on_close() const { return m_should_exit_app_on_close; }
-    void set_should_exit_event_loop_on_close(bool b) { m_should_exit_app_on_close = b; }
-
     GWidget* hovered_widget() { return m_hovered_widget.ptr(); }
     const GWidget* hovered_widget() const { return m_hovered_widget.ptr(); }
     void set_hovered_widget(GWidget*);
@@ -160,7 +157,6 @@ private:
     Color m_background_color { Color::WarmGray };
     GWindowType m_window_type { GWindowType::Normal };
     bool m_is_active { false };
-    bool m_should_exit_app_on_close { false };
     bool m_destroy_on_close { true };
     bool m_has_alpha_channel { false };
     bool m_double_buffering_enabled { true };