Quoting spiralofhope (spiralofhope@???):

> If memory serves, GTK3 has had a history of incredibly stupid decisions
> mid-version which broke a number of things like aspects of themes. For
> example, my GTK3 apps no longer have underlined hotkeys until I hold
> the alt key.

Quite.

These are some of the reasons why I applaud the LXDE team (with their
Razor-Qt partners) for making the difficult but wise decision to jump
ship from GTK and migrate to Qt (for LXQt). It shows a commendable
ability to rationally plan.