Unknown shortcut
Answered
While doing some Java coding I've accidentally pressed a random shortcut command and got myself with this. There was something that popped up and I pressed enter.
http://prntscr.com/gy94ew - Right after the line number.
I don't know what it does or how to get rid of it.
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It's a bookmark with the mnemonic letter, see https://www.jetbrains.com/help/idea/managing-bookmarks.html.
Thank you very much.