Screen exit transitions

Currently, lv_scr_load_anim only supports enter transition, where the current screen get’s visual replaced by the new screen (fade in, over in).

It would be cool (and I need something like this) to also have the possibility to exit the current screen (fade out/over away). So the current screen actual does the animation and the new screen is already the correct place (under) the current screen.

This allows something like visual stacking of screens.

Maybe it is somehow possible already. Does anybody know?

PR: https://github.com/lvgl/lvgl/pull/3081

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