At current time key 'F' does nothing. I have tried to assign 'F' to 'Fill' tool, but with no success. After I set 'F' as hotkey for Fill Tool, nothing is changed, it still does nothing (do not change current tool to 'Fill').

How can I property assign "Fill" to 'F' hotkey?

It seems, that F already is default key for Fill tool. I have deleted %APPDATA%/Krita folder and Shortcut dialogs shows that F is key for Fill Tool. But it doesn't work even after this config reset.