Call something a buffer when it refers to a linked list of linestructs,
and call something a linestruct when it is a struct that describes a
single line.

Because nothing gets reset to zero or to some initial value.

The interval 2013-2017 for the Free Software Foundation is valid
because in those years there were releases with changes by either
Chris or David, and the GNU maintainers guide advises to mention
a new year in all files of a package, not just in the ones that
actually changed, and be done with it for the rest of the year.

Copying text involves first cutting it and then quickly pasting it back.
However, cutting the text may change firstcolumn if the mark is offscreen.
To keep the viewport unchanged, copy_text() has to save and restore not
just edittop, but firstcolumn as well.

Add the new function less_than_a_screenful() to accomplish this.
It uses go_back_chunks() to count the number of softwrapped chunks
between the end point and the starting point of the paste.

Now softwrap mode and non-softwrap mode behave the same way when
uncutting fewer than editwinrows rows of text.  Accordingly, remove
the call to ensure_line_is_visible(), as it no longer applies.

The name "filestruct" was a mistake.  What was meant was:
buffer -- a linked list of structs that each describe a line.

When replacements are made, nothing needs to be reset any more
(it was done insufficiently anyway).  Just make sure the screen
is refreshed when all is done -- this may be superfluous when
doing interactive replacements, but not when replacing all.

This fixes https://savannah.gnu.org/bugs/?50009.

The setting of current_y in copy_from_filestruct() also appears to be
a holdover from the days of a more-common STATIONARY scrolling mode.

do_cut_text() uses the above function when copying text (uncutting
text again right after cutting it).  Since the text is effectively
the same afterward, current_y doesn't need to change.

do_uncut_text(), however, does need current_y up to date in one case:
when uncutting a full screen or less' worth of lines, focusing will be
FALSE, and it uses edit_refresh(), so it will use STATIONARY scrolling
mode then.  Take a cue from do_insertfile() and call reset_cursor() to
get an updated current_y.

(Note that the check for a full screen or less' worth of lines uses
incorrect values when in softwrap mode, but that's a separate problem.)

undo_cut(), do_redo(), and backup_lines() do not need set current_y
because they all result in edit_refresh() with focusing = TRUE, so
they do a CENTERING scroll which does not need current_y.

This fixes https://savannah.gnu.org/bugs/?49964.

This fixes https://savannah.gnu.org/bugs/?49962.

Mentioning "GNU nano" instead of "This program" and referring to the
website instead of to a postal address.

Since nano-2.4.1, reading in or pasting a large piece of text would put
the cursor on the bottom line, leaving only one line of the non-read or
non-pasted text visible.  This is different from the centering behavior
of Pico, and somewhat disorienting, as you can't see "where you are" any
more in relation to the file as it was.

So now center the cursor whenever the read or pasted text is larger than
the screen, but don't center it when the text fits entirely on the screen.
(The latter avoids the effect of the screen jumping unnecessarily when
inserting just a few lines while the cursor is near the bottom.)

To achieve this behavior: default to focusing, and temporarily set it to
FALSE when the focusing effect is unwanted.

This fixes https://savannah.gnu.org/bugs/?47841.

For a little contrast with the function edit_refresh() -- it's
annoying that when you search for the latter you get to see all
the settings of the flag too.

This fixes Savannah bug #46980.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5671 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

so we can delete four annoying pre-checks.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5651 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5614 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5556 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5393 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

more symmetrical: wrapped in add_undo() + update_undo() where needed.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5390 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

        * src/cut.c (do_cut_text): Make sure to set modified even when
        using --enable-tiny.



git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5112 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

confusion with CUT_TO_END, which is about end-of-line.
Patch by Mark Majeres.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@5041 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

Patch by Mark Majeres.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4978 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4911 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

and handling multibyte characters correctly.
*Patch by Mark Majeres.*


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4908 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

and mentioning the name of the terminal-tickling character (NBSP).
Patch by David Lawrence Ramsey.


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4894 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

pastes.  This fixes many undo problems and Savannah bug #25585.
*Patch by Mark Majeres.*


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4893 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4826 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4769 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4767 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@4719 35c25a1d-7b9e-4130-9fde-d3aeb78583b8