Truncate and ellipsize long reactions

[jonnyandrew]

Changes

Ensure that long reactions are not displayed in their entirety by truncating at 16 characters and ellipsizing.

Note that 16 characters is arbitrary, chosen by me to allow for most simple one word reactions such as "Ok" and short phrases such as "running late!" and is subject to change in future.

Context

Part of #342

• From the spec:

  The key field in m.reaction can be any string so clients must take care to render long reactions in a sensible manner. For example, clients can elide overly-long reactions.

• Related to Collapse long list of message reactions #806 (comment)

• Design discussion

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 62.23% and project coverage change: +0.04 🎉

Comparison is base (31056f0) 56.88% compared to head (8e1b188) 56.93%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #821      +/-   ##
===========================================
+ Coverage    56.88%   56.93%   +0.04%     
===========================================
  Files          914      922       +8     
  Lines        23158    23564     +406     
  Branches      4684     4770      +86     
===========================================
+ Hits         13174    13416     +242     
- Misses        7904     8028     +124     
- Partials      2080     2120      +40     

Impacted Files	Coverage Δ
...n/kotlin/io/element/android/appnav/BackstackExt.kt	0.00% <0.00%> (ø)
...o/element/android/appnav/LoggedInEventProcessor.kt	0.00% <0.00%> (ø)
...element/android/appnav/room/LoadingRoomNodeView.kt	0.00% <0.00%> (ø)
...ment/android/features/location/impl/map/MapView.kt	27.73% <0.00%> (-0.42%)	⬇️
...nfirmaccountprovider/ConfirmAccountProviderView.kt	35.13% <0.00%> (-1.36%)	⬇️
...ges/impl/messagecomposer/AttachmentsBottomSheet.kt	44.44% <0.00%> (+18.86%)	⬆️
...d/features/preferences/impl/DefaultCacheService.kt	0.00% <0.00%> (ø)
...atures/preferences/impl/tasks/ClearCacheUseCase.kt	0.00% <0.00%> (ø)
...nt/android/libraries/architecture/ParentNodeExt.kt	6.25% <0.00%> (-27.09%)	⬇️
...aries/designsystem/atomic/atoms/PlaceholderAtom.kt	61.11% <0.00%> (ø)
... and 50 more

... and 5 files with indirect coverage changes

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[bmarty]

LGTM, thanks!