silence ReleaseMouse warning

Change-Id: I615b4877ab29075ed45149259260acfb2563cad8

vcl/source/window/seleng.cxx

@@ -280,7 +280,7 @@ bool SelectionEngine::SelMouseButtonUp( const MouseEvent& rMEvt )
 
 void SelectionEngine::ReleaseMouse()
 {
-    if (!pWin)
+    if (!pWin || !pWin->IsMouseCaptured())
         return;
     pWin->ReleaseMouse();
 }

vcl/source/window/toolbox.cxx

@@ -1251,7 +1251,8 @@ void ImplTBDragMgr::Dragging( const Point& rPos )
 void ImplTBDragMgr::EndDragging( bool bOK )
 {
     mpDragBox->HideTracking();
-    mpDragBox->ReleaseMouse();
+    if (mpDragBox->IsMouseCaptured())
+        mpDragBox->ReleaseMouse();
     mpDragBox->mbDragging = false;
     mbShowDragRect = false;
     Application::RemoveAccel( &maAccel );
@@ -3346,7 +3347,8 @@ void ToolBox::ImplFloatControl( bool bStart, FloatingWindow* pFloatWindow )
 
         mbDrag = false;
         EndTracking();
-        ReleaseMouse();
+        if (IsMouseCaptured())
+            ReleaseMouse();
     }
     else
     {

vcl/source/window/toolbox2.cxx

@@ -1335,7 +1335,8 @@ void ToolBox::EndSelection()
         if (mnCurPos != TOOLBOX_ITEM_NOTFOUND)
             InvalidateItem(mnCurPos);
         EndTracking();
-        ReleaseMouse();
+        if (IsMouseCaptured())
+            ReleaseMouse();
         Deactivate();
     }
 
@@ -1378,7 +1379,8 @@ void ToolBox::SetItemDown( sal_uInt16 nItemId, bool bDown, bool bRelease )
                 mbDrag = false;
                 mbSelection = false;
                 EndTracking();
-                ReleaseMouse();
+                if (IsMouseCaptured())
+                    ReleaseMouse();
                 Deactivate();
             }