All calls to get_modal and set_modal are done for weld::Dialog
instances, never for plain instances of/pointers to the weld::Window
base class.
Therefore, drop the methods from weld::Window and add them weld::Dialog
instead.
SalInstanceDialog was already overriding the SalInstanceWindow
implementations of both methods.
For QtInstanceWindow, these were not implemented yet, while
QtInstanceDialog already has implementations.
(If there were a real need, they could be implemented using
QWidget::isModal/QWidget::windowModality and
QWidget::setWindowModality.)
For GTK, move the GtkInstanceWindow::get_modal implementation
to GtkInstanceDialog and call gtk_window_set_modal directly
instead of GtkInstanceWindow::set_modal in
GtkInstanceDialog::set_modal.
Change-Id: I71431347f3bca9571c6fd4b7cf995bb79fb5b11d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176252
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Tested-by: Jenkins
