tdf#90994 Sidebar tab bar buttons should should have accessible names

The tab bar buttons (Properties, Styles and formatting, Gallery ...)
should expose their name to accessibility tools.

Change-Id: I5292ca848688cf93a046c3f5d8906ac35cee1cfe
Reviewed-on: https://gerrit.libreoffice.org/15639Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sfx2/source/sidebar/TabBar.cxx

@@ -262,6 +262,8 @@ bool TabBar::Notify (NotifyEvent&)
 VclPtr<RadioButton> TabBar::CreateTabItem (const DeckDescriptor& rDeckDescriptor)
 {
     VclPtr<RadioButton> pItem = ControlFactory::CreateTabItem(this);
+    pItem->SetAccessibleName(rDeckDescriptor.msTitle);
+    pItem->SetAccessibleDescription(rDeckDescriptor.msHelpText);
     pItem->SetHelpText(rDeckDescriptor.msHelpText);
     pItem->SetQuickHelpText(rDeckDescriptor.msHelpText);
     return pItem;