tdf#131120 use a replacement for GtkComboBox

the problems with GtkComboBox we have are:

1) https://gitlab.gnome.org/GNOME/gtk/issues/1910 has_entry long menus take
forever to appear (tdf#125388)

on measuring each row, the GtkComboBox GtkTreeMenu will call its
area_apply_attributes_cb function on the row, but that calls
gtk_tree_menu_get_path_item which then loops through each child of the menu
looking for the widget of the row, so performance drops to useless.

All area_apply_attributes_cb does it set menu item sensitivity, so block it
from running with fragile hackery which assumes that the unwanted callback is
the only one with a

2) https://gitlab.gnome.org/GNOME/gtk/issues/94
when a super tall combobox menu is activated, and the selected entry is
sufficiently far down the list, then the menu doesn't appear under wayland

3) https://gitlab.gnome.org/GNOME/gtk/issues/310
no typeahead support

4) we want to be able to control the width of the button, but have a drop down menu which
is not limited to the width of the button

5) https://bugs.documentfoundation.org/show_bug.cgi?id=131120
super tall menu doesn't appear under X sometimes

In general we often pack a lot into the comboboxes and the default ones don't
like that.

Overlay scrolling is turned off for the GtkTreeView replacement because
otherwise there are null-derefs in gtk on indicator->scrollbar on repeated
reopenings

Change-Id: I1b6164020996377341b5992d593a027b76021f65
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/91990
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

0 files changed, 0 insertions, 0 deletions