Same here. Could not understand why would this would happen? I would appreciate a fix for it as soon as possible. It's actually so annoying and confusing.

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@cristophercutas are you still having the issue? I can't reproduce it.

Apologies for the delayed response. Yes, I can still reproduce it. I am on version 0.11.10 (0.11.10).

I tried it on another machine (same specs) and it was reproducible. I could not reproduce it on 100% zoom setting, but on 80% zoom setting the cursor disappears, although the scenario may vary. On machine 1 it only disappears on empty new lines, on machine 2 it only disappears at the end of a non-empty line.

Hope this helps.

Digging around a little bit on this. It looks like this is an issue with CodeMirror. CodeMirror implements its own cursor, styled with a single border. When the app is zoomed to certain levels, the cursor disappears, but it's just a rounding error. If you set the border-width of .CodeMirror-cursor to 3px, it should be visible at all zoom levels.

You can also see correct cursor render behavior by putting your cursor in the tags field and zooming in and out - you should be able to see the cursor at all zoom levels.

Potential fixes for this include:

• Making the .CodeMirror-cursor element wider so it's always visible. It looks like the Jupyterlab people had this same issue and addressed it last October: https://github.com/jupyterlab/jupyterlab/pull/3164
• Submit a patch for CodeMirror 5 that addresses this. The CodeMirror team said it is difficult to fix with the way CodeMirror 5 is written, and they plan to address this and other issues in CodeMirror 6: https://github.com/codemirror/CodeMirror/issues/5056
• Use another editor component