#254340

r=pedemonte, sr=blizzard (platform specific), a=mkaply (OS/2 only)
Don't send mouse clicks to the default window proc - handle them ourselves

widget/src/os2/nsWindow.cpp

@@ -2465,6 +2465,8 @@ PRBool nsWindow::ProcessMessage( ULONG msg, MPARAM mp1, MPARAM mp2, MRESULT &rc)
             // there's no need to clear this on button-up
           gLastButton1Down.x = XFROMMP(mp1);
           gLastButton1Down.y = YFROMMP(mp1);
+          WinSetActiveWindow(HWND_DESKTOP, mWnd);
+          result = PR_TRUE;
           break;
         case WM_BUTTON1UP:
           if (!mIsScrollBar)