]] misbehaves from the last three markdown headers

[Ambrevar]

Issue type

• Bug report

Environment

Emacs version: GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.10) of 2017-04-22
Operating System: Arch Linux
Evil version: 1.2.12
Evil installation type: MELPA
Graphical/Terminal: Graphical
Terminal multiplexer: No.

Reproduction steps

• Start Emacs on the following buffer in Markdown mode (2.2).

foo

# header 0

foo

# header 1

foo

# header 2

foo

# header 3

foo

Expected behavior

Pressing ]] should place the point on the first '#' of the next markdown header.

Actual behavior

Pressing ]] when the point is after the third-to-last section (header 1 in the example), the point is moved beyond its expected location.

[wasamasa]

This is the result of another oddity with thingatpt.el. Movement for ]] is done in terms of evil-defun (which is like a regular defun except that movement signals whether it's been successful or not) and generally done with evil-forward-beginning. In the case you describe it first goes to the end of the evil-defun at point, then moves to the end of the next one with forward-thing, then back to the beginning of the next one with beginning-of-thing. The last step fails for your test data, to reproduce go to the last newline and evaluate M-: (bounds-of-thing-at-point 'evil-defun).

I'm not sure whether evil can do anything about this, other than trying to move back until it's possible to navigate by a defun. This might be the fault of markdown-mode if their functions for beginning-of-defun and end-of-defun are suboptimal. Can you reproduce this problem with other modes defining those?

[Ambrevar]

Markdown mode is the only mode where I've noticed this behaviour.
I can think of C mode which has its own beginning-of-defun and end-of-defun, but it does not suffer from this issue.

Should I open an issue for Markdown mode?

[wasamasa]

Thanks for opening the issue with markdown-mode, I've checked out the latest version and no longer get that bug! Feel free to reopen if you still do.