gtkcombobox: in has-entry case, allow entry be shorter that 150px

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 by work around the issue gtk#1422 for the
GtkComboBox case.
1 file changed