rhbz#965646: sd: unregister slide sorter listener to avoid crashes

sd::slidesorter::controller::Listener::Notify(): when the ~SdDrawDocument
sends a HINT_MODELCLEARED, unregister since the document doesn't exist
any more.  This should hopefully avoids accessing a SfxViewShell
instance that has apparently already been deleted somewhere in one of
the listeners.

Change-Id: I0ba9a58d77741a52b652a6c55c2327db80859011
(cherry picked from commit a9e0c222f504104124485ef4684ce6f79d3dee52)
Reviewed-on: https://gerrit.libreoffice.org/4813
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/sd/source/ui/slidesorter/controller/SlsListener.cxx b/sd/source/ui/slidesorter/controller/SlsListener.cxx
index 17a8a141045b..e85a6c85f6d7 100644
--- a/sd/source/ui/slidesorter/controller/SlsListener.cxx
+++ b/sd/source/ui/slidesorter/controller/SlsListener.cxx
@@ -304,6 +304,13 @@ void Listener::Notify (
         SdrHint& rSdrHint (*PTR_CAST(SdrHint,&rHint));
         switch (rSdrHint.GetKind())
         {
+            case HINT_MODELCLEARED:
+                if (&rBroadcaster == mrSlideSorter.GetModel().GetDocument())
+                {   // rhbz#965646 stop listening to dying document
+                    EndListening(rBroadcaster);
+                    return;
+                }
+                break;
             case HINT_PAGEORDERCHG:
                 if (&rBroadcaster == mrSlideSorter.GetModel().GetDocument())
                     HandleModelChange(rSdrHint.GetPage());