lokit: double check for disposed windows & fix leak.

it seems we can get windows disposed before we get to the emission.

<segv>
vcl::Window::IsTracking() const vcl/source/window/window2.cxx:341
(anonymous namespace)::LOKPostAsyncEvent(void*, void*) sfx2/source/view/lokhelper.cxx:725
LokChartHelper::postMouseEvent(int, int, int, int, int, int, double, double) include/rtl/ref.hxx:112
SwXTextDocument::postMouseEvent(int, int, int, int, int, int) sw/source/uibase/uno/unotxdoc.cxx:3561

Change-Id: I93aea931dad1e7f43d3d610568424c53d2b22fbc
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/127907

sfx2/source/view/lokhelper.cxx

@@ -679,9 +679,7 @@ namespace
     {
         std::unique_ptr<LOKAsyncEventData> pLOKEv(static_cast<LOKAsyncEventData*>(pEv));
         if (pLOKEv->mpWindow->isDisposed())
-        {
             return;
-        }
 
         int nView = SfxLokHelper::getView(nullptr);
         if (nView != pLOKEv->mnView)
@@ -700,6 +698,9 @@ namespace
         if (!pFocusWindow)
             pFocusWindow = pLOKEv->mpWindow;
 
+        if (pLOKEv->mpWindow->isDisposed())
+            return;
+
         switch (pLOKEv->mnEvent)
         {
         case VclEventId::WindowKeyInput:
@@ -708,11 +709,13 @@ namespace
             KeyEvent singlePress(pLOKEv->maKeyEvent.GetCharCode(),
                                  pLOKEv->maKeyEvent.GetKeyCode());
             for (sal_uInt16 i = 0; i <= nRepeat; ++i)
-                pFocusWindow->KeyInput(singlePress);
+                if (!pFocusWindow->isDisposed())
+                    pFocusWindow->KeyInput(singlePress);
             break;
         }
         case VclEventId::WindowKeyUp:
-            pFocusWindow->KeyUp(pLOKEv->maKeyEvent);
+            if (!pFocusWindow->isDisposed())
+                pFocusWindow->KeyUp(pLOKEv->maKeyEvent);
             break;
         case VclEventId::WindowMouseButtonDown:
             pLOKEv->mpWindow->LogicMouseButtonDown(pLOKEv->maMouseEvent);

vcl/source/window/window2.cxx

@@ -311,7 +311,7 @@ void Window::EndTracking( TrackingEventFlags nFlags )
 
 bool Window::IsTracking() const
 {
-    return (ImplGetSVData()->mpWinData->mpTrackWin == this);
+    return mpWindowImpl && (ImplGetSVData()->mpWinData->mpTrackWin == this);
 }
 
 void Window::StartAutoScroll( StartAutoScrollFlags nFlags )