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What kind of feature is this and how to disable it?

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I've used the wrong shortcut, but I don't remember what I pressed. When I kill the buffer and open the same file again I have those markers. The thing is global because When I reload the other buffer I get the same markers. Is there a way to turn this off, without closing Emacs?

I was searching for different things but all I have is whitespace-mode that I use for different purposes (to highlight trailing whitespace and tabs). I think it's some fundamental function in Emacs, but I don't know how to name it (to find it in docs).

jcubic
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I've found it it was M-c M-w I make this accidentally when using M-c w (I use this to toggle indentation modes between 4 and 2 spaced). The key sequence was mapped to web-mode-whitespaces-show. Web-mode is my main mode I use for editing TypeScript files.

jcubic
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  • You might want to mention how you found it, if you think what you did to find it might help others. Thx. – Drew Jun 14 '22 at 14:30
  • @Drew It was an accident like the first time I tried the same key with CTRL and the markers disappeared. – jcubic Jun 14 '22 at 16:48