gtkcombobox: in has-entry case, allow entry be shorter that 150px
requested to merge 1422-gtkentry-s-minimum-width-is-hardcoded-to-150px-GTK3-combo-workaround into gtk-3-24
When "has-entry" is true (GtkCombobox has an editable GtkEntry) allow the GtkEntry to be shorter than 150px and thus match the ComboBox width when this is shorter than 150px.
This fixes evince#1002 (closed) by work around the issue #1422 (closed) for the GtkComboBox case.
Issue #1422 (closed)