[stable25] Change app menu focused items behavior that neighbor elements (text and border) have no overlapping

[backportbot-nextcloud]

• ⚠️ This backport had conflicts and is incomplete

backport of #35501

[ChristophWurst]

@JuliaKirschenheuter please make sure the diff is actually complete. I see fewer changes here than in the original PR.

Afterwards also cherry-pick the changes of #35545 onto this PR's branch.

[ChristophWurst]

#35771 (comment) done?

[ChristophWurst]

/build fixup /

[ChristophWurst]

/compile fixup /

[ChristophWurst]

Untracked files:
(use "git add ..." to include in what will be committed)
dist/icons.css

[PVince81]

Untracked files:
(use "git add ..." to include in what will be committed)
dist/icons.css

I tried this locally without any git apps in "apps":
make dev-setup && make build-js-production && npm run sass && npm run sass:icons && git status

and there are no changes to commit, so icons.css is in the correct state (for both @JuliaKirschenheuter and I)
also rebased on top of origin/stable25

and yet the node test complains ?

[PVince81]

okay, looks like a gitignore quirk: the changeset on Github says that "icons.css" got removed, but recompiling locally and git status doesn't offer to re-add it.

I've now been able to explicitly readd it with git add dist/icons.css

@JuliaKirschenheuter be careful when discarding changes in "dist", never use delete operations and always "git checkout origin/stable25 dist/" instead