@b4n Thanks for testing! I'll only be able to test on the real hardware tomorrow (edit: later today :-). But at least on the Xorg VM I use, when I added some printfs into `tick_cb()` of the GTK progressbar and recompiled GTK, it fired like crazy even after `ui_progress_bar_stop()`.
I think I'll report this to GTK because this is very unexpected - either there should be some `stop()` method in the API that does the same as `gtk_progress_bar_set_fraction(progressbar, 0.0)` or it should be documented that `gtk_progress_bar_set_fraction(progressbar, 0.0)` should be called to stop this.