Especially color \a and \t, to make it easier to distinguish them
from contiguous text.

When the keyboard buffer is empty, return a value that is not equivalent
to <Ctrl+Space>, so that typing a bunch of these while searching is going
on will not result in some of them getting executed afterward.

It is not an abort but simply a bit of cleaning up.

Also adjust and correct a comment.

This makes it easier to predict in which direction the replacements
will go when hitting ^\ or M-R.
Signed-off-by: Liu Hao <lh_mouse@126.com>

Indenting/unindenting always happens in a single contiguous block.
Lines that cannot or should not be indented or unindented do not
need to remembered separately as it follows from their content.

Suggested-by: Brand Huntsman <alpha@qzx.com>

This fixes https://savannah.gnu.org/bugs/?53532.

To prevent any filenames containing hyphens getting partially colored.
Reported-by: Brand Huntsman <alpha@qzx.com>

Put it after the function that it calls, and before the functions
it is called from.

That is, do not fall back to the default background color when the
name for the background color is invalid, but reject the entire
color command, just like for an invalid foreground color.

Also add some comments, and accept hyphens in function names.

This allows a syntax to remove the color from things that were colored
overeagerly by earlier regexes.

This fixes https://savannah.gnu.org/bugs/?53445.

Also, reshuffle a condition so it takes up less space.

This variable will be modified by go_forward_chunks(), but the value
of openfile->current itself should be maintained.

An "if possible" would have been nice, but there is no room for that.

This will make the tiny version slightly smaller.