Don't crash on SidebarController dispose when app is closing

When app is closing it is possible SfxGetpApp() will return null. So
GetCurrentTheme() cannot return reference to correct theme.
Remember which theme has registered SidebarController to unregister when
disposing.

Change-Id: If223233f621601f445472b0413a56e9c51e59673
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118970
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Pranam Lashkari <lpranam@collabora.com>

2 files changed, 11 insertions, 5 deletions

diff --git a/sfx2/source/sidebar/SidebarController.cxx b/sfx2/source/sidebar/SidebarController.cxx
index 64dbe4343b14..266a69f5dcbe 100644
--- a/sfx2/source/sidebar/SidebarController.cxx
+++ b/sfx2/source/sidebar/SidebarController.cxx
@@ -170,7 +170,8 @@ rtl::Reference<SidebarController> SidebarController::create(SidebarDockingWindow
     instance->mpParentWindow->AddEventListener(LINK(instance.get(), SidebarController, WindowEventHandler));
 
     // Listen for theme property changes.
-    Theme::GetPropertySet()->addPropertyChangeListener(
+    instance->mxThemePropertySet = Theme::GetPropertySet();
+    instance->mxThemePropertySet->addPropertyChangeListener(
         "",
         static_cast<css::beans::XPropertyChangeListener*>(instance.get()));
 
@@ -305,9 +306,10 @@ void SAL_CALL SidebarController::disposing()
         mpParentWindow = nullptr;
     }
 
-    Theme::GetPropertySet()->removePropertyChangeListener(
-        "",
-        static_cast<css::beans::XPropertyChangeListener*>(this));
+    if (mxThemePropertySet.is())
+        mxThemePropertySet->removePropertyChangeListener(
+            "",
+            static_cast<css::beans::XPropertyChangeListener*>(this));
 
     maContextChangeUpdate.CancelRequest();
 }
diff --git a/sfx2/source/sidebar/Theme.cxx b/sfx2/source/sidebar/Theme.cxx
index dbbcabeadd55..b3a35c078011 100644
--- a/sfx2/source/sidebar/Theme.cxx
+++ b/sfx2/source/sidebar/Theme.cxx
@@ -34,6 +34,7 @@ namespace sfx2::sidebar {
 
 Theme& Theme::GetCurrentTheme()
 {
+    OSL_ASSERT(SfxGetpApp());
     return SfxGetpApp()->GetSidebarTheme();
 }
 
@@ -198,7 +199,10 @@ void SAL_CALL Theme::disposing()
 
 Reference<beans::XPropertySet> Theme::GetPropertySet()
 {
-    return Reference<beans::XPropertySet>(static_cast<XWeak*>(&GetCurrentTheme()), UNO_QUERY);
+    if (SfxGetpApp())
+        return Reference<beans::XPropertySet>(static_cast<XWeak*>(&GetCurrentTheme()), UNO_QUERY);
+    else
+        return Reference<beans::XPropertySet>();
 }
 
 Reference<beans::XPropertySetInfo> SAL_CALL Theme::getPropertySetInfo()