I have been reporting this problem (and others like it) to Apple Support for a long time now. So far I have been completely ignored. No fixes were ever made for the UI problems I have found in 10.11 and 10.12.
I was easily able to reproduce all but one of his examples on my Mac. I had seen a few of these cases before, but my use patterns are such that I don’t run into this bug very often, and thus it has not caused as much frustration for me.
In what world is it OK to have a cursor like this one when the mouse is right in the middle of a paragraph of text in a word processor?
I really don’t know what it would take to make @apple acknowledge the flakiness of context-based cursor changes in #macOS AND ELIMINATE IT.
Update (2017-03-08): Nick Heer:
It was trivial for me to reproduce Stephen Braddy’s bug video, and it’s something I’ve noticed all the time on MacOS for the past couple of major versions of the operating system.
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