don't run generate preview idle if there are no fonts in the list

and reset preview idle when font list is cleared

Change-Id: Ice8c149754fbf64c9f81aa812465f0269de4c9d0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/93161
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/svtools/source/control/ctrlbox.cxx b/svtools/source/control/ctrlbox.cxx
index f5ad5df85fe5..fafc2cb02868 100644
--- a/svtools/source/control/ctrlbox.cxx
+++ b/svtools/source/control/ctrlbox.cxx
@@ -423,6 +423,8 @@ void FontNameBox::InitFontMRUEntriesFile()
 void FontNameBox::ImplDestroyFontList()
 {
     mpFontList.reset();
+    mnPreviewProgress = 0;
+    maUpdateIdle.Stop();
 }
 
 void FontNameBox::Fill( const FontList* pList )
@@ -453,9 +455,9 @@ void FontNameBox::Fill( const FontList* pList )
 
     m_xComboBox->thaw();
 
-    if (mbWYSIWYG)
+    if (mbWYSIWYG && nFontCount)
     {
-        mnPreviewProgress = 0;
+        assert(mnPreviewProgress == 0 && "ImplDestroyFontList wasn't called");
         maUpdateIdle.Start();
     }