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bug#41198: 28.0.50; heading cycling command for outline

From: Paul W. Rankin
Subject: bug#41198: 28.0.50; heading cycling command for outline
Date: Sat, 28 Nov 2020 11:58:51 +1000
User-agent: Purely Mail via Roundcube/1.4.7

On 2020-11-27 18:29, Juri Linkov wrote:
I tried to modify the format of `C-h b' to output '*' headings,
but unfortunately after enabling `outline-minor-mode'
TAB has no effect on such headings.

I wonder why heading cycling implemented in this bug report
supports only `outline-mode', but not `outline-minor-mode'?

It would make sense in `outline-minor-mode' if TAB typed on a heading
then cycle outline heading.  If TAB is typed outside of a heading,
then use the default TAB binding, e.g. in case of the Help buffer
navigate to the next link.

This is because it's not possible to know how the underlying major mode implements TAB.

For just one example, I maintain a major mode where TAB performs outline cycling when at a heading, but calls completion-at-point when at a heading but at eolp. The assumption of outline-on-heading-p is insufficient to allow outline-minor-mode to hijack TAB.

The correct way to implement what you're suggesting is for the major mode to require outline as a library, then alias the cycling commands prefixed as MODE-outline-cycle[-buffer] mapped them to TAB/S-TAB in their own keymaps.

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