Buttons in window handles are overly sensitive to drags with touch input
The gtk-dnd-drag-threshold
defaults to 8, which is okay for a mouse, but in some cases (especially with large buttons) may be too sensitive for touch input.
As an example, https://gitlab.gnome.org/cghobbs/chess-clock/-/issues/3 is an issue with a chess clock app I'm developing, which requires users to tap large buttons that were wrapped in a GtkWindowHandle until the latest release. It was very easy to accidentally drag the button, especially when playing quickly, resulting in the touch being ignored. There's now a hackish workaround in place. Changing the drag threshold for the app as a whole may cause some unpleasant UX because of different windows in the system needing different amounts of drag distance before they begin moving.
Note that this actually affects every app that has buttons in a GtkWindowHandle/GtkHeaderBar. I would think the right solution would be to have a higher threshold for touch than for a mouse, but that's not currently possible as far as I know.
Somewhat related in spirit: #5580 (closed).