test for IsMouseCaptured before releasing mouse

like the other call sites do

Change-Id: I77250f172f9d9ce97e5982bafbc8f042e9343acc

sc/source/ui/view/hdrcont.cxx

@@ -879,8 +879,8 @@ void ScHeaderControl::StopMarking()
 
     //  don't call pSelEngine->Reset, so selection across the parts of
     //  a split/frozen view is possible
-
-    ReleaseMouse();
+    if (IsMouseCaptured())
+        ReleaseMouse();
 }
 
 void ScHeaderControl::ShowDragHelp()

vcl/source/window/mouse.cxx

@@ -468,10 +468,10 @@ void Window::ReleaseMouse()
 
     ImplSVData* pSVData = ImplGetSVData();
 
-    SAL_WARN_IF( pSVData->maWinData.mpCaptureWin.get() != this, "vcl",
+    SAL_WARN_IF(!IsMouseCaptured(), "vcl",
                        "Window::ReleaseMouse(): window doesn't have the mouse capture" );
 
-    if ( pSVData->maWinData.mpCaptureWin.get() == this )
+    if (IsMouseCaptured())
     {
         pSVData->maWinData.mpCaptureWin = nullptr;
         mpWindowImpl->mpFrame->CaptureMouse( false );

vcl/source/window/window.cxx

@@ -249,13 +249,13 @@ void Window::dispose()
 
     DBG_ASSERT( pSVData->maWinData.mpTrackWin.get() != this,
                 "Window::~Window(): Window is in TrackingMode" );
-    DBG_ASSERT( pSVData->maWinData.mpCaptureWin.get() != this,
-                "Window::~Window(): Window has the mouse captured" );
+    DBG_ASSERT(!IsMouseCaptured(),
+                "Window::~Window(): Window has the mouse captured");
 
     // due to old compatibility
     if ( pSVData->maWinData.mpTrackWin == this )
         EndTracking();
-    if ( pSVData->maWinData.mpCaptureWin == this )
+    if (IsMouseCaptured())
         ReleaseMouse();
     if ( pSVData->maWinData.mpDefDialogParent == this )
         pSVData->maWinData.mpDefDialogParent = nullptr;