Resolves: tdf#100903 Calc hangs when preediting Japanese with GTK plugin

... + Mozc.
This issue shares a common root with tdf#56937.

Change-Id: Ic5720c19f22f7e6b047e1251b34f90d04ce7eee7
Reviewed-on: https://gerrit.libreoffice.org/27305Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/gtk/gtksalframe.cxx

@@ -3807,6 +3807,8 @@ uno::Reference<accessibility::XAccessibleEditableText>
             if (xText.is())
                 return xText;
         }
+        if (xState->contains(accessibility::AccessibleStateType::MANAGES_DESCENDANTS))
+            return uno::Reference< accessibility::XAccessibleEditableText >();
     }
 
     for (sal_Int32 i = 0; i < xContext->getAccessibleChildCount(); ++i)

vcl/unx/gtk3/gtk3gtkframe.cxx

@@ -3928,6 +3928,8 @@ uno::Reference<accessibility::XAccessibleEditableText>
             if (xText.is())
                 return xText;
         }
+        if (xState->contains(accessibility::AccessibleStateType::MANAGES_DESCENDANTS))
+            return uno::Reference< accessibility::XAccessibleEditableText >();
     }
 
     for (sal_Int32 i = 0; i < xContext->getAccessibleChildCount(); ++i)