This fixes https://savannah.gnu.org/bugs/?53088.

When copying a string, source and destination may not be equal --
complain loudly when they are, instead of failing to free memory.

Also, instead of freeing the destination string and then allocating
it afresh, just reallocate it -- that should be slightly quicker.

When doing for example: ^W xx ^R ^C ^W, the "xx" would again be shown
after the prompt.  This is wrong -- when starting a new search, the
current answer should be empty.
Reported-by: Marco Diego Aurélio Mesquita <marcodiegomesquita@gmail.com>

Instead of weaving back and forth between do_search()/do_replace() and
search_init() every time that one of the options is toggled, just keep
looping in the latter function until the user presses <Enter>.

The weaving for the do_gotolinecolumn() function remains, but is
shortened to involve only search_init().

This fixes https://savannah.gnu.org/bugs/?53062.

Suggested-by: Mike Frysinger <vapier@gentoo.org>

This addresses https://savannah.gnu.org/bugs/?48992.

In this way a single keystroke can produce a fragment of text or a
series of commands, or a mix of the two.  It is like a prerecorded
macro.

This fulfills https://savannah.gnu.org/bugs/?52931.

This brings it in line with the other three "flip" toggles.

This fixes https://savannah.gnu.org/bugs/?52997.

This fixes https://savannah.gnu.org/bugs/?52972

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

When a fragment of help text does not contain any whitespace that
we can wrap at, just advance the pointer, because returning zero
would mean we stay forever at the same place: nano would hang.

After commit e739448c, macros should work also when ncurses produces
escape sequences instead of keycodes.

So one doesn't find it when grepping for get_input().

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

That is, call display_string() just on the filename, not on the rest
of the prompt text.

This fixes https://savannah.gnu.org/bugs/?52967

.
Reported-by: Andreas Schamanek <schamane@fam.tuwien.ac.at>

And one for me, for the much changed keyboard stuff.

Also, actually add the long option --trimblanks to the table.

This fixes the second part of https://savannah.gnu.org/bugs/?52960.

This fixes the first part of https://savannah.gnu.org/bugs/?52960.

This fixes https://savannah.gnu.org/bugs/?52930

.
Reported-by: Michail Tsiolkas <mtsio@cryptolab.net>

Also, reshuffle a case, to put the short one first and lose a line.

Instead of assuming that the entire contents of the keybuffer are an
escape sequence (even if this is far longer than any escape sequence
can be), remove from the keybuffer only those integers that actually
constituted a sequence, valid or invalid.

This fixes https://savannah.gnu.org/bugs/?48659.