sublimetext3
what is the red arrow on the left of the line numbers in Sublime
What does the red arrow mean in Sublime Text editor between line 13 and 14?
Solution
This appears to be a new feature in Sublime 3.2 called diff marker. The red arrow is one of three diff markers indicating that the line before this was deleted, the two others having to do with adding new lines or modifying existing ones.
From a simple experiment it seems the reference is the state of the file when you opened it in Sublime, but there is also a way to integrate it with Git version control.
Official source: https://www.sublimetext.com/docs/3/incremental_diff.html#diff_markers
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