Esc does not close flameshot gui

Flameshot version Flameshot v0.8.5 (AppImage) Compiled with Qt 5.12.8

Describe the bug When any application tries to take over the screen, there will be almost no way to close Flameshot (other than pressing the X button). This happened to me during the following scenarios:

1. I was in the waiting room of a zoom call and I was taking a screenshot with Flameshot that they let me in the Zoom call and then there was no way to close Flameshot (Esc was not working)
2. While taking a screenshot I pressed AltTab accidentally and then the Esc was non functional. (This scenario was much easier to repeat)

To Reproduce

1. flameshot gui
2. press AltTab (or what ever shortcut you use to switch windows
3. press Esc to close

Expected behavior Esc works as long as flameshot gui is open.

System Information Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS (Ubuntu Budgie) DE: Budgie Release: 18.04 Codename: bionic Display server protocol: X11