ComboBox bug that causes flickering when opening a second ComboBox

[lalala]

I would like to see it fixed too, I had reported the same issue a few months ago :

Combo box menu flickering (with multiple combo boxes)

When having 2 (or more) combo boxes, if you open the menu of the 2nd one while the menu of the other one is open, you often get a flicker (behaviour depends the speed of the click and if the menu takes time to create/show up I think). to reproduce (with code below to simply replace the Misc page of the tabs&widgets demo) : click on the first Combobox to open the menu click slowly on the second one (staying a bit with the button down helps seeing the flickering/understanding the bug) . struc…