[Bug] Syntax highlighting breaks after discarding changes

[FeBe95]

Description

Steps to reproduce:

1. Open any project/repository.
2. Select "Local Changes" in left sidebar.
3. Select any unstaged file.
4. Discard some changed lines in the file preview (by clicking "Discard" or pressing the "Del" key).

Expected result:

• Syntax highlighting stays intact when discarding changes.

Actual result:

• Syntax highlighting breaks sometimes when discarding changes.
• A view update is required to fix it (e.g. by pressing the "F5" key).

Screen recording

1. Selected a change.
2. Pressed the "Del" key to discard.
3. Pressed the "Enter" key to confirm.
4. Syntax highlighting stayed intact.
5. Selected a second change.
6. Pressed the "Del" key to discard.
7. Pressed the "Enter" key to confirm.
8. Syntax highlighting broke:
   • blue or in $oldScoreTeam1
   • missing string highlighting for "goals" and "goalsAgainst"
   • orange Minute in ->matchMinute
   • ...
9. Pressing the "F5" key fixes it.

20260611-1059-27.8471093.mp4