Custom picker: Allow deeper zoom

[nicolas-raoul]

Steps to reproduce:

screen-20240422-204714.mp4

From that screen it is difficult to remember what the picture shows, here is a picture zoomed as deep as possible (on mobile it appears so small that it is impossible to read):

The same picture can be zoomed in much deeper using Google Photos' gallery app:

Similar but different: #1500

[rohit9625]

I want to work on this task 😀

[nicolas-raoul]

@rohit9625 I unassign for now, but if you are you still working on this, please let us know. If no answer, someone else may be assigned to it. Thanks a lot. :-)

[mnalis]

See idea in linked #5789:

Perhaps we could just call external default gallery/image viewer app (via intent) to display that picture on long-press?
That would be much faster, fix the related zoom bug, give user the choice, and probably reduce the code.

[mnalis]

Also, panning doesn't seem to work in zoomed image in Custom picker...
Hopefully move to Jetpack Compose mentioned in #5789 (comment) might fix that too