Icon Selector very laggy and cpu intensive

[zhrexl]

Describe the Bug

When the icon selector is opened it gets very laggy, its really hard to select an icon. The CPU goes to 100% when scrolling the GtkIconView (Core i7 12700H).

Steps to reproduce the behavior:

1. Go to Menu Editor
2. Try to select a new icon for the menu

Here's a sysprof print recording the behaviour

Expected Behavior

Not be laggy at all just like others icon selectors.

If more information is needed I can try to gather it.

System

• Fedora 38
• GNOME Shell version: 44

[Schneegans]

Yeah, I know that it can be laggy sometimes. The amount of "lagginess" depends on the icon theme you use. With the default Adwaita icons it's OK on my machine. Bigger icon sets can be more demanding.

However, I think there's no easy fix as the GtkIconView is simply too slow for this use-case. I could rewrite the dialog using a more modern widget such as the GtkGridView but this will make it difficult to remain backward-compatible. When GNOME 45 is released later this year, Fly-Pie will need some severe porting which will drop support for all older GNOME versions anyways. After that, it will be much easier to clean up some of the GTK3 legacy code in the UI.