Steps to reproduce:
1. runemacs.exe -Q
2. In the scratch buffer, M-x org-mode
3. M-: (setq org-catch-invisible-edits 'show-and-error)
(could be also reproduced with 'smart)
4. Replace the content of the scratch buffer with the following:
* hello
** world
5. Position point at the end of "hello", press Tab to collapse.
So it looks like this:
* hello<point>...
6. Press Del.
Expected result:
Edit should be prevented because it deletes invisible character.
Actual result:
Edit is performed without any warning.
By the way, the editor ends up in corrupt state because the content
of the buffer is now "* hello** world", but it is displayed as
"* hello..." and you can't uncollapse it by pressing Tab anymore.
Version info:
GNU Emacs 26.2 (build 1, x86_64-w64-mingw32) of 2019-04-13
Org mode version 9.1.9 (release_9.1.0-65-g5e4542 @
c:/emacs/share/emacs/26.2/lips/org/)
