Primary menu popover changes size when opening the first time
For some reason buttons in Adwaita have min-width and min-height animated and they change for zoom/print/find/fullscreen buttons right after popover is opened for the first time.
An easy solution would be to disable the animation, but it doesn't happen anywhere else, so maybe there is some initialization being done on first showing instead of when the popover is created.
Edited by Alice Mikhaylenko