W32: correctly guess max window size from the size of the workarea of the screen...

Get monitor on which the most of the window is located (nearest monitor if
window is not on screen), get its work area (area not occupied by taskbar or
any other bars) and use that for maxsize.

Previous default of 30000 meant that windows maximized onto full screen,
even covering the area where taskbar is.

https://bugzilla.gnome.org/show_bug.cgi?id=726592

diff --git a/gdk/win32/gdkevents-win32.c b/gdk/win32/gdkevents-win32.c
index 59292d59738660cdc61688012364bcf1fa3f2716..4b32f1c735a9158f0032c88c32bdb3f31efaf91f 100644 (file)
--- a/gdk/win32/gdkevents-win32.c
+++ b/gdk/win32/gdkevents-win32.c
@@ -3076,8 +3076,27 @@ gdk_event_translate (MSG  *msg,
        }
       else
        {
-         mmi->ptMaxTrackSize.x = 30000;
-         mmi->ptMaxTrackSize.y = 30000;
+         HMONITOR winmon;
+         MONITORINFO moninfo;
+
+         winmon = MonitorFromWindow (GDK_WINDOW_HWND (window), MONITOR_DEFAULTTONEAREST);
+
+         moninfo.cbSize = sizeof (moninfo);
+
+         if (GetMonitorInfoA (winmon, &moninfo))
+           {
+             mmi->ptMaxTrackSize.x = moninfo.rcWork.right - moninfo.rcWork.left;
+             mmi->ptMaxTrackSize.y = moninfo.rcWork.bottom - moninfo.rcWork.top;
+           }
+         else
+           {
+             /* Apparently, this is just a very big number (bigger than any widget
+               * could realistically be) to make sure the window is as big as
+               * possible when maximized.
+               */
+             mmi->ptMaxTrackSize.x = 30000;
+             mmi->ptMaxTrackSize.y = 30000;
+           }
        }
 
       if (impl->hint_flags & (GDK_HINT_MIN_SIZE | GDK_HINT_MAX_SIZE))