Removed no longer needed desktop size hack

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@49699 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -107,8 +107,6 @@ wxGTK:
   a background colour bug in the gtk-qt theme under KDE.
 - wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW) now returns the background
   colour of text controls.
-- Added gtk.desktopmargin.x/y system options to allow windows to fit the desktop
-  when Xinerama is not available.
 
 wxMac:
 

docs/latex/wx/sysopt.tex

@@ -45,8 +45,6 @@ used if wider fonts selection is more important than higher quality.}
 \twocolitem{{\bf Option}}{{\bf Value}}
 \twocolitem{gtk.window.force-background-colour}{If 1, the backgrounds of windows with the wxBG\_STYLE\_COLOUR background style are cleared forcibly instead
 of relying on the underlying GTK+ window colour. This works around a display problem when running applications under KDE with the gtk-qt theme installed (0.6 and below).}
-\twocolitem{gtk.desktopmargin.x}{The horizontal margin to subtract from the desktop size when Xinerama is not available.}
-\twocolitem{gtk.desktopmargin.y}{The vertical margin to subtract from the desktop size when Xinerama is not available.}
 \end{twocollist}
 
 \wxheading{Mac}

src/gtk/utilsgtk.cpp

@@ -139,11 +139,8 @@ void *wxGetDisplay()
 
 void wxDisplaySize( int *width, int *height )
 {
-    int marginX = wxSystemOptions::GetOptionInt(wxT("gtk.desktopmargin.x"));
-    int marginY = wxSystemOptions::GetOptionInt(wxT("gtk.desktopmargin.y"));
-
-    if (width) *width = gdk_screen_width() - marginX;
-    if (height) *height = gdk_screen_height() - marginY;
+    if (width) *width = gdk_screen_width();
+    if (height) *height = gdk_screen_height();
 }
 
 void wxDisplaySizeMM( int *width, int *height )