Reported-by: Tom Levy <tomlevy93@gmail.com>

The anchored "^texture" appears to have been a mistake.
Inspired-by: Tom Levy <tomlevy93@gmail.com>

Signed-off-by: Tom Levy <tomlevy93@gmail.com>

The fragment "\<\." can never match anything because \< matches the
beginning of a word but "." is not a word character.

Replace \< with \B (the empty string not at the edge of a word).
Signed-off-by: Tom Levy <tomlevy93@gmail.com>

Also remove some redundant backslashes and parentheses.

The list now includes all the Lua 5.3 functions listed on
https://www.lua.org/manual/5.3/#index

.

Also, remove the coloring of just the library name, so that
only known library functions get highlighted.
Signed-off-by: Tom Levy <tomlevy93@gmail.com>

As of Lua 5.2: "Hexadecimal constants also accept an optional fractional
part plus an optional binary exponent, marked by a letter 'p' or 'P'"
(see at the end of https://www.lua.org/manual/5.2/manual.html#3.1).

The new regexes do not match a leading nor a trailing dot, but they
are good enough.  Discussion on the mailing list:
https://lists.gnu.org/archive/html/nano-devel/2017-12/msg00121.html

Signed-off-by: Tom Levy <tomlevy93@gmail.com>

Since a "0x" by itself is invalid.  Also add word boundaries, so that
e.g. "00x1" (which is invalid) does not get partial highlighting.

Also remove some redundant backslashes from the strings regex.
Signed-off-by: Tom Levy <tomlevy93@gmail.com>

To keep the blocks of text more-or-less aligned.

Each leading tab is converted to two tabs, and any leading four spaces
is converted to one tab.  The intended tab size (for keeping most lines
within 80 columns) is now four.

This fixes https://savannah.gnu.org/bugs/?52755

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

When unindenting/uncommenting affected the bottom line of the marked
region, keep affecting this line also during subsequent consecutive
indenting/commenting.

This fixes https://savannah.gnu.org/bugs/?52718.

Functions such as "io.close" should only be highlighted when the
package name ("io") is a word by itself, otherwise code such as
"fooio.close" gets unexpected partial highlighting.
Signed-off-by: Tom Levy <tomlevy93@gmail.com>

So that Commenting comes closer to the somewhat related Indenting
and Unindenting functions.

Also, make the descriptions for indenting/unindenting more precise.

So they will be found quicker.

Also fold two assignments into one.

Also, remove angle-bracketed "strings" -- they don't exist.

Also, remove the coloring of special single-quoted strings as they
get recolored by the subsequent general string-coloring command.

And remove the coloring of all-uppercase words, as other editors
do not color those either.

Either by whitespace or by the start of a line.

This avoids treating part of a URL as a comment.

They were mistakenly added by changeset fb85c055, four commits ago.

This fixes https://savannah.gnu.org/bugs/?52717.