Created attachment 155923 [details] Tapping the sort dropdown button. SUMMARY STEPS TO REPRODUCE 1. Tap the sort dropdown button 2. Tap and hold the sort dropdown button, then slide finger off the button OBSERVED RESULT 1. The dropdown opens then closes 2. The dropdown opens and stays open EXPECTED RESULT 1. The dropdown stays open 2. When dragging onto the menu, releasing the finger should activate that menu item. When dragging off the menu, releasing the finger should close the menu. SOFTWARE/OS VERSIONS ADDITIONAL INFORMATION
Quite challenging to implement, and we don't have it for desktop comboboxes either. See Bug 439734.
This report was more about not being able to open the menu with a single tap (which I assume most people would do). The tap-and-drag was more of a secondary issue that I thought of as I was writing the report (tbh I expect there to be very few people who use this feature on mobile phones). I probably should have added a comment to that report instead of writing about it here.
Hmm, I'm not sure what this bug is about then because when I tap the button with Elisa in mobile mode, it opens and stays open. I wasn't able to test with the default Material style though. Maybe it only reproduces with that. If so it might be a bug in that style, if our code looks sane.