Unregister event filter when surface to close

Prevents crash in two window manual test where the object
is deleted when PlatformSurfaceFilter destructor tries
to remove the event filter

Change-Id: I1a37a3cb9088be462957ffbd4412ae5e5241f2df
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/render/backend/platformsurfacefilter.cpp b/src/render/backend/platformsurfacefilter.cpp
index 891e30c44..7458f607d 100644
--- a/src/render/backend/platformsurfacefilter.cpp
+++ b/src/render/backend/platformsurfacefilter.cpp
@@ -107,6 +107,10 @@ bool PlatformSurfaceFilter::eventFilter(QObject *obj, QEvent *e)
             // If we remove it, the call to isSurfaceValid will
             // implicitely return false
             PlatformSurfaceFilter::m_surfacesValidity.remove(m_surface);
+            if (m_obj) {
+                m_obj->removeEventFilter(this);
+                m_obj = nullptr;
+            }
             break;
         }