When sending user mentions, always send the user id as the fallback text

[jmartinesp]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

• Make sure the rich text editor and the markdown one both send mentions with the user id as the fallback text for the permalink.

Motivation and context

Sending the user's display name can lead to other clients rendering outdated names or incorrect ones, so we'd rather fall back to the user id.

Tests

Send user mentions with both the RTE enabled and disabled, check the formatted body contains user id as the link's fallback text.

Tested devices

• Physical
• Emulator
• OS version(s): 14

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[sonarcloud]

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 SonarCloud

[bmarty]

Thanks!