starmath: Disable formula cursor toolbar button when inline editing is enabled

It is ignore when inline editing is enable, so better disable it to make
it clear.

Change-Id: Ie79a1c16109109e213658d44a6ffc0bff2291c7a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156487
Tested-by: Jenkins
Reviewed-by: خالد حسني <khaled@libreoffice.org>

starmath/source/view.cxx

@@ -2144,8 +2144,10 @@ void SmViewShell::GetState(SfxItemSet &rSet)
 
         case SID_FORMULACURSOR:
             {
-                SmModule *pp = SM_MOD();
-                rSet.Put(SfxBoolItem(nWh, pp->GetConfig()->IsShowFormulaCursor()));
+                if (IsInlineEditEnabled())
+                    rSet.DisableItem(nWh);
+                else
+                    rSet.Put(SfxBoolItem(nWh, SM_MOD()->GetConfig()->IsShowFormulaCursor()));
             }
             break;
         case SID_ELEMENTSDOCKINGWINDOW: