implement emotes (/me)

[ara4n]

requires matrix-org/matrix-rust-sdk#2648

closes #1107

Arguably this could be handled by a slash-command engine in matrix-sdk-ui, but given it's not clear EX is going to even have slash commands (given whatsapp & imessage & signal etc don't), I'm adding it as a quick & dirty easter egg in the application layer. Given the logic is so simple, I'm not convinced it's worth the complexity of shoving it into the SDK at this point.

Handles:

• plaintext/markdown msg which begins /me
• richtext editor msg whose plaintext/markdown representation begins /me
• editing existing plaintext msgs
• editing existing richtext msgs
• replying with a /me (plaintext)
• replying with a /me (richtext)

Pull Request Checklist

• I read the contributing guide
• Pull request contains a changelog file in ./changelog.d

[github-actions]

	Warnings
⚠️	Some of the commits are missing ticket numbers. Please consider squashing all commits that don't have a tracking number.
⚠️	Please add a sign-off to either the PR description or to the commits themselves.

Generated by 🚫 Danger Swift against 984e9a5

[ara4n]

How do I make the tests run against the right sdk branch name? (EW would at least automatically try to build against the branch of the same name in the SDK...)

[stefanceriu]

Left comments inline for a couple of small tweaks that need to happen. Otherwise looks sensible to me.

@Velin92 you were going to look into user suggestions this week. They should probably be based on CompletionSuggestion from the old codebase which also supports slash commands so please take this PR under your wing.

[stefanceriu]

run against the right sdk branch name?

There is nothing like that atm. We agreed to look into building the sdk on the CI after the next release and this can very well be a part of that work.

[manuroe]

run against the right sdk branch name?

There is nothing like that atm. We agreed to look into building the sdk on the CI after the next release and this can very well be a part of that work.

We will also need to improve the infra. GH action runners are slow to build the SDK bindings. They take 4h to build them for Android. This would be way too long to validate a PR on EAX or EIX.

[ara4n]

ptal @stefanceriu

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (e6fa1ba) 71.49% compared to head (984e9a5) 71.31%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1841      +/-   ##
===========================================
- Coverage    71.49%   71.31%   -0.19%     
===========================================
  Files          442      442              
  Lines        30058    30083      +25     
  Branches     14738    14748      +10     
===========================================
- Hits         21490    21453      -37     
- Misses        8031     8093      +62     
  Partials       537      537              

Flag	Coverage Δ
unittests	54.83% <0.00%> (-0.17%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...meline/TimelineItems/RoomTimelineItemFactory.swift	20.94% <0.00%> (ø)
...urces/Screens/RoomScreen/RoomScreenViewModel.swift	55.76% <0.00%> (-0.43%)	⬇️
ElementX/Sources/Services/Room/RoomProxy.swift	24.77% <0.00%> (-0.73%)	⬇️

... and 2 files with indirect coverage changes

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