Fix leak with stock widgets in a dialog from an extension

When loading a dialog from XDL, buttons can have dlg:button-type="cancel"
or dlg:button-type="help". These buttons might not have a peer when
they are not referenced from the extension.

In this case, they also weren't disposed when the dialog was disposed,
leading to an abort on exit.

Change-Id: I799d7535b766984fde47cafbe41ee6e89e476205
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135266
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Samuel Mehrbrodt <samuel.mehrbrodt@allotropia.de>
(cherry picked from commit 4879f99b824036b3d409ed52f74dc3eb3b4949e4)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135745
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

0 files changed, 0 insertions, 0 deletions