This has been happening for about a week now. If I open up devtools and then double click on a class, id, or some other attribute, it gets highlighted as expected.
However, when I click in the highlighted area to set my cursor position for editing, there is no effect. It completely ignores the mouse click and I'm forced to use my keyboard cursor keys which places the cursor at the beginning or end of the string rather than the spot I want it. It's not just my mouse, I tried using the touchpad on my keyboard with the same results, likewise on a touch screen.
Note: not only is the highlighted area ignoring mouse clicks, the line it's on ignores the clicks (clicking on a different line unfocuses the edit area as normal.)
Another note: if I double click i the css panel to highlight a value the mouse works fine, I can set my cursor position in any part of the highlighted area.
I've made sure I'm up to date, and I've use the "default settings" option in the devtools more than once.
I'm using chrome canary 73.0.3669.0
Any ideas?