More robust DND detection on Linux

[hovancik]

related #1528

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 15.09%. Comparing base (75dfd1d) to head (69fc49d).
Report is 14 commits behind head on trunk.

Files with missing lines	Patch %	Lines
app/utils/dndManager.js	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1538      +/-   ##
==========================================
+ Coverage   15.05%   15.09%   +0.04%     
==========================================
  Files          30       30              
  Lines        1966     1967       +1     
==========================================
+ Hits          296      297       +1     
  Misses       1670     1670              

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