Improves RT window position management, fixes #6233 (#6239)

* Improves RT window events detection and RT window position computation

* Fixes some limitations in specific cases for Windows and MacOS

* Fixes RT window not restoring saved position at startup

- When maximized at startup, RT window position wasn't restored from
options file. So when unmaximazing RT, position was set to up left
corner instead of restored one
- Other fix: Removed some uses of deprecated Gtk functions

* Improves RT window management for independant edit window mode

Other fixes:
- Monitor ID wasn't correctly computed
- Removes some other deprecated functions uses
- Removes debug printf

* Fixes editor window aspects not restored in MEOW mode on Linux

Other fixes:
- Removes some Gtk warnings when adding a new editor panel in MEOW mode
- Adds robustness to avoid RT windows outside screen at startup loading
corrupted options file with negative position values

* Fixes incorrect max position saturation in dual screen configurations

rtgui/editwindow.h

@@ -21,6 +21,7 @@
 #include <gtkmm.h>
 
 #include "rtimage.h"
+#include "guiutils.h"
 
 class EditorPanel;
 class RTWindow;
@@ -40,17 +41,20 @@ private:
 
     bool isFullscreen;
     bool isClosed;
+    bool isMinimized;
+    sigc::connection onConfEventConn;
     void toggleFullscreen ();
-    void restoreWindow();
     bool updateResolution();
     void setAppIcon();
 
+    IdleRegister idle_register;
+
 public:
     // Check if the system has more than one display and option is set
     static bool isMultiDisplayEnabled();
 
-    // Should only be created once, auto-creates window on correct display
-    static EditWindow* getInstance(RTWindow* p, bool restore = true);
+    // Should only be created once
+    static EditWindow* getInstance(RTWindow* p);
 
     explicit EditWindow (RTWindow* p);
 
@@ -65,8 +69,10 @@ public:
     bool keyPressed (GdkEventKey* event);
     bool on_configure_event(GdkEventConfigure* event) override;
     bool on_delete_event(GdkEventAny* event) override;
-    //bool on_window_state_event(GdkEventWindowState* event);
+    bool on_window_state_event(GdkEventWindowState* event) override;
     void on_mainNB_switch_page(Gtk::Widget* page, guint page_num);
     void set_title_decorated(Glib::ustring fname);
     void on_realize () override;
+    void get_position(int& x, int& y) const;
+    void restoreWindow();
 };