Add ability to swipe between media when opened from the timeline.

[bmarty]

Content

Add ability to swipe between media when open from the timeline. Previously it was only possible to swipe when the media was opened from the media gallery.

Motivation and context

Closes #4174
Closes #1484

Screenshots / GIFs

MediaViewerSwipe.mp4

Tests

• Open a room with some media / files
• Click on a media
• Observe that you can now swipe left or right to navigate between the medias of the room.

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 90.57377% with 23 lines in your changes missing coverage. Please review.

Project coverage is 80.19%. Comparing base (9e5c5fa) to head (c059c3f).
Report is 19 commits behind head on develop.

Files with missing lines	Patch %	Lines
...droid/libraries/matrix/impl/room/RustMatrixRoom.kt	0.00%	8 Missing ⚠️
...raries/mediaviewer/impl/viewer/PagerKeysHandler.kt	69.56%	2 Missing and 5 partials ⚠️
...iaviewer/impl/datasource/MediaGalleryDataSource.kt	63.63%	1 Missing and 3 partials ⚠️
...aries/mediaviewer/impl/gallery/MediaGalleryView.kt	81.25%	3 Missing ⚠️
...raries/mediaviewer/impl/model/GroupedMediaItems.kt	88.88%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4205   +/-   ##
========================================
  Coverage    80.18%   80.19%           
========================================
  Files         2023     2026    +3     
  Lines        53280    53378   +98     
  Branches      6451     6469   +18     
========================================
+ Hits         42723    42804   +81     
- Misses        8339     8346    +7     
- Partials      2218     2228   +10     

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[ganfra]

Thanks, good job!
See some of my remarks, otherwise LGTM.
We'll probably iterate later to improve with event cache!

[ganfra]

I'm not sure to understand this method

[bmarty]

It's maybe not needed but it's here to protect a Timeline that would not return the expected Event.
Originally I though that mediaTimeline would return faster, with an empty list of Event, but it seems that it actually return only when the expected Event has been retrieved. This is why there is this code now: groupedMediaItemsFlow.emit(AsyncData.Success(cache)) at the beginning of method TimelineMediaGalleryDataSource.start().

So the method orCache is probably not needed, but I prefer to keep it as a safety measure.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud