[stable-3.9] Do not modify discovered files on disk if not necessary

[backportbot-nextcloud]

Backport of #5872

[codecov]

Codecov Report

Merging #5958 (0ca358c) into stable-3.9 (6dfcc86) will decrease coverage by 0.11%.
Report is 56 commits behind head on stable-3.9.
The diff coverage is 100.00%.

❗ Current head 0ca358c differs from pull request most recent head 832f0f8. Consider uploading reports for the commit 832f0f8 to get more accurate results

Additional details and impacted files

@@              Coverage Diff               @@
##           stable-3.9    #5958      +/-   ##
==============================================
- Coverage       60.41%   60.30%   -0.11%     
==============================================
  Files             145      145              
  Lines           18653    18657       +4     
==============================================
- Hits            11269    11252      -17     
- Misses           7384     7405      +21     

Files Changed	Coverage Δ
src/csync/csync_exclude.cpp	89.81% <ø> (ø)
src/common/filesystembase.cpp	76.58% <100.00%> (+0.14%)	⬆️
src/libsync/syncengine.cpp	81.12% <100.00%> (+0.07%)	⬆️

... and 4 files with indirect coverage changes

[nextcloud-desktop-bot]

AppImage file: nextcloud-PR-5958-832f0f8764b756d56b391e673fe60e878fbcc663-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.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

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