Triggering Note input during playback should be blocked

[DmitryArefiev]

Issue type

Playback/Note input issue

Case 1: During Playback, triggering Note input by double click should be blocked

1. Open score
2. Start playback
3. By single click you can move playback cursor position
4. Now try a double click - it triggers Note input mode (which should be disallowed during playback, because you can input some odd notes accidentally)

https://user-images.githubusercontent.com/90187801/234383655-d507f6a1-ea71-45fb-bd32-010862d25401.mp4

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Case 2: Triggering Note input via N or clicking Pencil icon should be blocked during playback (if Note input was triggered before starting playback or during playback) - initially was reported as #8739

1. Open score
2. Click on pencil from the Note input bar or press N
3. Click "Play" button from playback panel
4. Click on the score > notes added while score is playing

https://user-images.githubusercontent.com/71372310/127183431-61368bd1-0214-412b-be7c-b5bf72af1118.mp4

MuseScore Version

4.1

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

Windows 10

Additional context

Related to #8739

[DmitryArefiev]

This issue a bit more serious than #8739 because in the current issue Note input can be triggered accidentally by double click during playback

[bkunda]

Can reproduce in Win and on macOS. Interestingly, note input mode is only triggered if you click on an empty space on the stave; it does not seem to get triggered when clicking on any other engraving element (as far as I can tell: tested on notes, rests, dynamics, articulations, and text).

[bkunda]

@DmitryArefiev I'd suggest re-scoping this issue to include blocking all methods of enabling note input mode during playback. If you agree, we can expand your issue description a bit and close #8739.

[DmitryArefiev]

@bkunda Yeah, good idea! I'll do it