`x` is often criticized as hard to predict due to its slightly complex
behaviour of selecting next line if the current one is fully selected.
Change `x` to use the previous `<a-x>` behaviour, and change `<a-x>` to
trim to fully selected lines as `<a-X>` did.
Adapt existing indentation script to the new behaviour
When `set` or `se` is found at the start of the modeline, it should stop parsing options after `:`.
When `modeline-parse` is called in the following file, it should _not_ recognize `tabstop=4` and `invalid_option=3`.
```
# kak: set indentwidth=0 tabstop=16: tabstop=4 invalid_option=3
```
More info: http://vimdoc.sourceforge.net/htmldoc/options.html#modeline
This commit makes `:modeline-parse` grab all lines that look like
modelines, and lets the parser deal with invalid formats.
This allows actually printing an error on unsupported modelines
formats, instead of ignoring them upfront.
This commit prevents specially crafted modelines from making the
editor execute arbitrary Kakoune commands.
By using a tabulation character as a separator, commands can be
injected in the value of the options listed in the modeline. For
example:
# kak: tabstop=2;set-option buffer pwned yes
Fixes#3735.
This commit addresses an off-by-one error that selected `modelines`+1
lines when looking for modelines in a buffer.
Note that setting `modelines` to 0 will still select one line.
Fixes#3733.
Similarly to the <semicolon> key, make it easier to write
`:execute-keys` commands by replacing <percent> with `%`.
Highlighters can keep escaping the sign when regular expressions are
not quoted, but built-in scripts that use `%` as an editing primitive
have been modified to use the named key, for clarity.
