What is this red dot?

Features
1

Is this a new feature?
With recent updates, there sometimes is a red dot appearing in the editor.
I don't know what it is.

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2

The red dot might be from the CodeMirror v6 highlightSpecialChars extension. By default, it replaces several invisible characters (e.g. zero-width spaces) with a placeholder.

Before the recent updates, Joplin desktop used CodeMirror 5 by default, which may have replaced a different set of special characters. For example, CodeMirror 5 shows a red dot instead of a null character, but might not show a replacement character in other circumstances where CodeMirror 6 does.

Note: For comparison, it's possible to re-enable the CodeMirror 5 editor in settings > general > advanced.

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3

Thanks for the explanation! I've encountered this dot in some of my notes imported from Evernote (in rare cases, I must add).