Additionally allow `recursive-narrow-or-widen-dwin` to also trigger
`org-edit-src-code` within org buffers. This technically does not use
narrowing, but it does "focus" on the source code block for editing, so
it at least in spirit embodies the intent of narrowing.
This behavior was inspired by:
https://endlessparentheses.com/emacs-narrow-or-widen-dwim.html
This module wraps around the fill-column-indicator and it's
fci-mode. This will enable easy switch-over to Emacs 27's native
display-fill-column-indicator feature.
Also create a new siren-display-line-numbers module and function that's
responsible for turning on the display of line numbers. Future changes
to how line numbers are displayed can now be done in a single place.
- Switch from highlight-indentation package to highlight-indent-guides.
- Activate visual indentation in a prog-mode hook, rather than doing
within each individual major mode. It was already done within all
major modes based on prog-mode anyway.
- Add new siren-display-indetation module and function as a central way
to enable visual indetation guides. This makes switching the
underlying package at some point in the future much easier.
