Rename the new uid option

[yume-chan]

• I have checked that a similar feature request does not already exist.

dev branch has a new option called uid, for differentiating multiple running Scrcpy instances. IMO it should not be called uid, because uid is a common Linux concept, which might be useful in other cases.

For example, with this little change, I can create a secure display on rooted Android 12+ devices (tested in an emulator):

https://github.com/Genymobile/scrcpy/compare/dev...yume-chan:scrcpy:feat/secure-display?expand=1

Unrooted:

Rooted:

Use setUid(2000) instead of 1000 can fix issues like #1606

So, the new option should be renamed, the new name can be instance_id or other more descriptive names.

[rom1v]

I renamed from uid to scid: 439a1fd 👍

(I want to keep the name short, because on some devices app_process segfaults when the total command length exceeds 256)

For example, with this little change, I can create a secure display on rooted Android 12+ devices

Oh, great 👍

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I see that you are doing a lot of R&D work, that's awesome 👍 (I'm still working on audio integration, I'm refactoring a lot of things in scrcpy to handle it properly.)

Do you work on it in the context of ya-webadb?

[yume-chan]

ya-webadb is my personal open-source side project, which starts at an experiment of WebUSB API. Before that, I had very little experience on C, Java and Android.

I wouldn't say my works on Scrcpy is "for" or "in the context of" that project. I knew and used Scrcpy way before starting ya-webadb. Integration of Scrcpy in ya-webadb is simply because Scrcpy is the best application I know that uses ADB and Android Shell permission.

[rom1v]

Thank you for your work anyway, very useful! 👍