fix: merge adjacent textmarkers #11887
Merged
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Proposed changes
Git often emits a separate sequence for the first +/-, merge this with the reminder of the line.
This is a minor performance improvement (probably not possible to detect),
for big files number of textmarkers slow down.
Also set the terminal backcolor to SystemColors.Window if unset (instead of hardcoding to White).
Test methodology
Tests adjusted
Merge strategy
I agree that the maintainer squash merge this PR (if the commit message is clear).
✒️ I contribute this code under The Developer Certificate of Origin.