This does not look like Google Chrome issue - because it works as expected in other websites.
- Select a piece of text you would like to quote.
- Change your mind and try to remove the selection by clicking somewhere outside of the selected text, but on the same line where the text is. Selection is not removed. This is annoying.
For me this happens when I click to the right or to the left of text in a blank area where there is no text anymore.
I tried in many other websites and could not reproduce this, so I suppose it is specific to Discourse.
On the screencast below, you can’t see where the mouse is - but actually I’m clicking just to the right of the selected text.