Validate hotkey when setting it

[VictoriousRaptor]

• Prevent user from setting single "Alt" "Ctrl" "Shift" "Win" as hotkey. Fix flow launcher got an error #1755.
• Prevent setting single alphanumeric key as hotkey.
• • When a pressed hotkey is unavailable, stay focused inside the text box so user can continue to try a new hotkey.
• When clicked away and the hotkey is unavailable, return to the previous set hotkey.

Tests:

• Toggle hotkey can be modified.
• Preview hotkey can be modified.
• Single special key can't be set as hotkey.
• Single function key can be set as hotkey.
• Single alphanumeric key can't be set as hotkey.
• When a pressed hotkey is unavailable, stay focused inside the text box so user can continue to try a new hotkey.
• When clicked away and the hotkey is unavailable, return to the previous set hotkey.

[jjw24]

Can we:

1. When a hotkey is unavailable, stay focused inside the text box so user can continue to try new hotkey.
2. When clicked away and the hotkey is unavailable, return to the previous set hotkey.

[taooceros]

I just remember I have a very old pr regarding this #933. Well but it is a bit hacky....

[VictoriousRaptor]

Closed by accident somehow.

[VictoriousRaptor]

Can we:

1. When a hotkey is unavailable, stay focused inside the text box so user can continue to try new hotkey.

2. When clicked away and the hotkey is unavailable, return to the previous set hotkey.

Please review again.

[VictoriousRaptor]

Checking for all symbol keys are too difficult so I just ban alphanumeric keys.

changed

[jjw24]

👍