Ensure errors are displayed as first entries in tray window activity list, add testing for SortedActivityListModel

[claucambra]

At the moment they are often pushed way down the list below less important entries such as notifications due to their activity type

With this PR we ensure they are first on the list

With this PR:

Master:

Screen.Recording.2023-02-06.at.15.25.39.mov

[claucambra]

/backport to stable-3.7

[codecov]

Codecov Report

Merging #5408 (74bdbb4) into master (9727440) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5408      +/-   ##
==========================================
+ Coverage   60.05%   60.08%   +0.02%     
==========================================
  Files         145      145              
  Lines       18762    18762              
==========================================
+ Hits        11268    11273       +5     
+ Misses       7494     7489       -5     

see 1 file with indirect coverage changes

[mgallien]

this is missing automated tests

[claucambra]

this is missing automated tests

Took a lot of changes to not duplicate masses of code, but the sort order is now fully tested (and the sortedactivitylistmodel in general)

[github-actions]

⚠️ clang-tidy found issue(s) with the introduced code (1/1)

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

94.4% Coverage
0.0% Duplication

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5408-6b4bf71a5ee68cff7bdc1bc5842407f8bc1c750d-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.

No clang-tidy warnings found so I assume my comments were addressed

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

94.4% Coverage
0.0% Duplication

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[backportbot-nextcloud]

The backport to stable-3.7 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable-3.7
git pull origin stable-3.7

# Create the new backport branch
git checkout -b fix/foo-stable-3.7

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable-3.7

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5408-74bdbb4aa13bf92bff05e82b3a4605d6a224f9f7-x86_64.AppImage

To test this change/fix you can simply download above AppImage file and test it.

Please make sure to quit your existing Nextcloud app and backup your data.