See here, between line 15 and 16. Does it just indicate a blank line? If so, why?
It means a line has been deleted from the previous version of the file (based on git).
A red triangle indicates where lines have been deleted. A green bar indicates new added lines. A blue bar indicates modified lines.
Visual Studio Code indicates the line on which the breakpoint is set by displaying a red dot in the left margin.
Visual Studio Code contains a set of built-in icons that are used in views and the editor, but can also be used in hovers, the status bar, and by extensions. These icons are product icons as opposed to file icons, which are used next to file names throughout the UI.
It called a "Gutter Indicator".
It means a line has been deleted from the previous version of the file (based on git).
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