Also, be more selective when coloring a git diff line.  And color
an svn index line too.

This addresses https://savannah.gnu.org/bugs/?49803.

Like do_down() does already, do_pageup() and do_right() should use
editwincols instead of COLS.

This addresses https://savannah.gnu.org/bugs/?49796.

The functions read() and fwrite() take size_t, not ssize_t.

And line numbers in the file should be displayed as a long type instead
of an int, since the effective type of ssize_t is not int, but long.

(The variable 'pletion_line' is not conditionalized with this option, as
it would become messy.  The compiler will probably be able to elide it.)

When using --enable-tiny, it is not possible to use --enable-wordcomp,
because the word completion function uses the undo system.

Executing the 'complete_a_word' function will search from the start
of the current buffer for entire words that begin with the fragment
that is before the cursor, and will complete this fragment to the
first word that is found.  Each consecutive call of 'complete_a_word'
will search for the next matching word and will complete the fragment
to that.  By default the function is bound to the ^] keystroke.
Signed-off-by: Sumedh Pendurkar <sumedh.pendurkar@gmail.com>
Signed-off-by: Benno Schulenberg <bensberg@justemail.net>

But do it correctly this time: don't switch it on when replacing.

None of the prompts offer a total-refresh shortcut -- only the
edit window, the help viewer, and the file browser provide this.

It's redundant because the call of total_refresh() wipes everything.

At the very beginning of do_replace(), nothing has been changed
or initialized yet, so there is nothing to refresh or clean up.

This fixes https://savannah.gnu.org/bugs/?49750.

Modern VTE-based terminals now produce codes for those keys and
no longer swallow them when nano is active.

This addresses https://savannah.gnu.org/bugs/?49746.

There is no need for that -- it just causes flicker.

This fixes https://savannah.gnu.org/bugs/?49742.

Only when doing replacements does the edit window need a refresh: for
every new spotlight.  So, do the update request in the latter routine.

(The previous commit fixed https://savannah.gnu.org/bugs/?49737.)

This fixes https://savannah.gnu.org/bugs/?48622.

For UTF-8 support under Slang, at least Slang 2.0 is needed.
And glib2 is also used for snprintf() if it's unavailable.

Achieve this by reusing the code that gives feedback when trying to
save a buffer while using --tempfile and the file has no name yet.

This fixes https://savannah.gnu.org/bugs/?48622.

Also for Delete, End, PageUp and PageDown (on some terminals)
the last byte in the sequence needs to be checked.

This fixes https://savannah.gnu.org/bugs/?49710.

Achieve this elegantly by factoring out the reading of one rcfile.

Also remove some unneeded prototypes, adjust some comments, and
move a constant definition to the top of the file.