Avoid calling gtk_window_get_position() from "configure-event" handler, if possible.

This avoids a round trip to the X server, which is expensive over a remote connection.
Closes #15116


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74664 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/toplevel.h

@@ -94,6 +94,8 @@ public:
 
     virtual void GTKHandleRealized();
 
+    void GTKConfigureEvent(int x, int y);
+
     // do *not* call this to iconize the frame, this is a private function!
     void SetIconizeState(bool iconic);
 
@@ -108,7 +110,11 @@ public:
                   m_gdkDecor;
 
     // size of WM decorations
-    wxSize m_decorSize;
+    struct DecorSize
+    {
+        int left, right, top, bottom;
+    };
+    DecorSize m_decorSize;
 
     // private gtk_timeout_add result for mimicing wxUSER_ATTENTION_INFO and
     // wxUSER_ATTENTION_ERROR difference, -2 for no hint, -1 for ERROR hint, rest for GtkTimeout handle.
@@ -119,7 +125,7 @@ public:
     // return the size of the window without WM decorations
     void GTKDoGetSize(int *width, int *height) const;
 
-    void GTKUpdateDecorSize(const wxSize& decorSize);
+    void GTKUpdateDecorSize(const DecorSize& decorSize);
 
 protected:
     // give hints to the Window Manager for how the size
@@ -145,7 +151,7 @@ protected:
 
 private:
     void Init();
-    wxSize& GetCachedDecorSize();
+    DecorSize& GetCachedDecorSize();
 
     // size hint increments
     int m_incWidth, m_incHeight;