lok: disable VCL painting and whole window invalidation.

The reasoning is somewhat complex:

void Window::ImplInvalidateFrameRegion( const vcl::Region* pRegion, InvalidateFlags nFlags )

sets the mnPaintFlags on the mpWindowImpl - and then queues an idle
paint. This paint in LOK mode does ~nothing - since all rendering is
tiled, although amazingly it does emit eg. selection callbacks.

However the paint flag - changes the behavior of Window::Update() to
force a complete window invalidate. This happens, but only rarely -
when a key-event manages to get into the mainloop before the idle
paint handler arrives and does nothing (except clear the paint flags).

So - don't do these big invalidations we don't need to in lok mode,
unless it is for dialogs - which presumably Pranav wanted fixed by
625087b5.

Change-Id: I88dda34b8d8bba9c89296d883ad9169fe49a7c5e
Reviewed-on: https://gerrit.libreoffice.org/71395
Tested-by: Jenkins
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

vcl/source/window/paint.cxx

@@ -33,6 +33,7 @@
 #include <salframe.hxx>
 #include <svdata.hxx>
 #include <comphelper/lok.hxx>
+#include <comphelper/profilezone.hxx>
 #if HAVE_FEATURE_OPENGL
 #include <vcl/opengl/OpenGLHelper.hxx>
 #endif
@@ -631,6 +632,8 @@ void Window::ImplCallOverlapPaint()
 
 IMPL_LINK_NOARG(Window, ImplHandlePaintHdl, Timer *, void)
 {
+    comphelper::ProfileZone aZone("VCL idle re-paint");
+
     // save paint events until layout is done
     if (IsSystemWindow() && static_cast<const SystemWindow*>(this)->hasPendingLayout())
     {
@@ -652,6 +655,8 @@ IMPL_LINK_NOARG(Window, ImplHandlePaintHdl, Timer *, void)
 
 IMPL_LINK_NOARG(Window, ImplHandleResizeTimerHdl, Timer *, void)
 {
+    comphelper::ProfileZone aZone("VCL idle resize");
+
     if( mpWindowImpl->mbReallyVisible )
     {
         ImplCallResize();
@@ -719,6 +724,7 @@ void Window::ImplInvalidateFrameRegion( const vcl::Region* pRegion, InvalidateFl
             pParent->ImplInvalidateFrameRegion( pChildRegion, nFlags );
         }
     }
+
     if ( !mpWindowImpl->mpFrameData->maPaintIdle.IsActive() )
         mpWindowImpl->mpFrameData->maPaintIdle.Start();
 }
@@ -1321,10 +1327,13 @@ void Window::Update()
         }
 
         pUpdateWindow->ImplCallPaint(nullptr, pUpdateWindow->mpWindowImpl->mnPaintFlags);
-        pUpdateWindow->LogicInvalidate(nullptr);
+
+        if (comphelper::LibreOfficeKit::isActive() && pUpdateWindow->GetParentDialog())
+            pUpdateWindow->LogicInvalidate(nullptr);
 
         if (xWindow->IsDisposed())
            return;
+
         bFlush = true;
     }