There's only one bug that keeps me from promoting Wallpaeper to Extras-testing, which is the following:

It's possible to open multiple windows after pressing a button more than once.

How can I make sure a button can only be pressed once? (or how can I make sure only one window is opened?)
I've tried: (after button press)
- Disable button before creating a new Manager window (but that seemed to go simultaneously, so the button was disabled just before or after the new window shows)
- Disable the button, if(disabled) - open window (same as above, strange..)
- A boolean that decides whether to open it or not (false if button pressed)
- disconnect() after button press
- if a Manager window is made, don't make it again (didn't work..)

None of these worked
It doesn't crash with multiple windows, there are just multiple windows without a parent window

So can anyone help me with either:
- Preventing double button press
- Setting QListWidget icons faster
Many thanks in advance!