fontchooser performance issue
I was taking a look at Apple's SF font, and found that the font chooser becomes very slow, slow enough to trigger the unresponsive app dialog whenever I select a different SF face in the font chooser.
We spend a long time in this code:
https://gitlab.gnome.org/GNOME/gtk/-/blob/main/gtk/gtkfontchooserwidget.c#L1851
@behdad: Should we be doing things differently here? This code is trying to collect examples for the effect of the OpenType features that the font supports.
Edited by Matthias Clasen