Dynamic resolution scaling of virtual displays.

[TheLastFlame]

Get rid of the need to restart the virtual display to change the aspect ratio.

How feasible is this?

I envision this feature working according to the following algorithm:

1. In the process of resizing the window, the image is not rebuilt
2. When the action is completed (releasing the mouse key), the current virtual display is deleted and the open content is transferred to a new one created with the new resolution.

This seems quite feasible, but perhaps there are some pitfalls?

[rom1v]

This branch from @anirudhb (referenced from #5370) implemented parts of it: https://github.com/anirudhb/scrcpy/commits/virtual-display/

the current virtual display is deleted and the open content is transferred to a new one created with the new resolution.

VirtualDisplay has a resize() method: https://developer.android.com/reference/android/hardware/display/VirtualDisplay#resize(int,%20int,%20int)

When the action is completed (releasing the mouse key)

Unfortunately, SDL does not provide specific events for "resize start", "resize end", we just receive resize events.

But that's not a problem, just introduce some delay (200~500ms) before considering a new resize event to request a virtual display resize.