I recently upgraded to Emacs 25.1.2, and transient-mark-mode no longer works properly - sometimes.

The behavior I see is that pressing C-spc and moving the cursor to select an area of text doesn't automatically highlight the area. If I move to another window and return, or switch to a different window and come back, I see the selection highlighted.

I also see the section highlighted if the cursor comes across a parenthesis. Since I have show-paren-mode turned on, the parens get highlighted, and the selection also gets highlighted.

It's suddenly working as expected as I type this, but it wasn't working for the past couple of days, in spite of restarts.

How do I debug what might be happening?

  • Basic troubleshooting. If you can reproduce this with emacs -Q it's an actual bug that ought to be reported to the Emacs maintainers. – Tyler Feb 3 '17 at 14:27
  • The problem hasn't recurred yet. But once it does, I will give that a shot. – Rajesh J Advani Feb 5 '17 at 9:13

I had exactly the same issue. In my case the issue was caused by using package "expand-region". A workaround for the issue is to add (setq shift-select-mode nil) to Emacs config file. For more details, see https://github.com/magnars/expand-region.el/issues/229 (and related issues #220, #225).

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.