Without them, nano still compiles for me, with everything enabled,
even when using --enable-debug, --enable-utf8, and --with-slang.

Prefer speed above being fully correct.

This addresses https://savannah.gnu.org/bugs/?51644.

Include the shortcut for 'Uncut' into most menus, and add an uncut
function for the status bar, so that it becomes possible to paste
the first line of the cutbuffer at any text-input prompt.

This fulfills https://savannah.gnu.org/bugs/?48501

.
Requested-by: Benno Schulenberg <bensberg@telfort.nl>
Signed-off-by: Rishabh Dave <rishabhddave@gmail.com>

Assume that a linter line that contains an actual error message or
warning includes a colon followed by a space -- something that that
opening message from a modern gcc lacks.

A cast on the same line as a variable declaration is superfluous,
because it effectively defines the type of the variable twice.

Human column numbers are one-based, whereas x positions are zero-based.
Converting from the one to the other involves subtracting one.  But when
the linter message does not provide a column number, the latter defaults
to zero.  Catch that case and change the number to one.

This fixes https://savannah.gnu.org/bugs/?51550.

The charalloc() macro does exactly this.

Commit 28beb3f9 added the 'forreal' parameter to prevent spotlight() from
placing the cursor wrongly due to an invalid placewewant.  However, since
the variable-width softwrap overhaul (specifically, since commit 8490f4ac),
place_the_cursor() no longer checks placewewant, so the parameter is no
longer needed.

Furthermore, dropping 'forreal' and thus always setting current_y won't
affect the operation of spotlight(), since the only functions that use
spotlight() (do_replace_loop() and do_int_spell_fix()) both call
edit_refresh() beforehand, which means that current_y will already
have been set to the value it will be set to again.

The function place_the_cursor() assumes that the viewport is up to date,
i.e., that current is in range of edittop.  When uncutting or inserting,
however, place_the_cursor() gets called on the out-of-date viewport
first, and then a screen refresh is scheduled (which would put the
viewport up to date).  This is backwards: the refresh should come before
the cursor placement, and the only reason it works anyway is because the
cap on the number of chunks to move backward papers over the problem by
keeping current_y in screen range regardless.

Fix this properly by simply setting current_y to the bottom row of the
screen instead of calling place_the_cursor().  This value of current_y
is only ever used when in smooth scrolling mode and the insertion (or
paste) pushed the cursor offscreen.  In other situations, this value is
overridden when place_the_cursor() gets called after a screen refresh.

After that fix, the cap on the number of chunks to move backward is no
longer needed.

A line can only be partially offscreen when doing softwrapping.

This fixes https://savannah.gnu.org/bugs/?51514.

This improves https://savannah.gnu.org/bugs/?51479 for the +-1 case.

When not using --smooth (nor 'set smooth'), and a line near or beyond
the end-of-file is addressed with the + command-line argument, then
center the cursor, just like Pico does -- so in the default mode,
nano is again more like Pico.

This partially addresses https://savannah.gnu.org/bugs/?51489.

Counting the added number of rows is only relevant when inserting
a file into the current buffer.  So don't waste time counting when
it's not needed.

This fixes https://savannah.gnu.org/bugs/?51479.

Since commit 8490f4ac, get_edge_and_target() depends on an up-to-date
current_x.  So: make sure current_x is updated when we move to the
top left of the screen to start a non-smooth PageUp or PageDown.

This fixes https://savannah.gnu.org/bugs/?51480.

For some reason, when returning from suspension, SLang will produce
either a clipped error code (0xFF instead of 0xFFFF, when returning
from an externally induced suspension), or it will clip the code of
first subsequent keystroke to a single byte (when returning from a
normal, in-editor suspension: ^Z).

Side-step this by ignoring the clipped error code, and by using an
undefined control code as the first fake keystroke.  Ignoring the
clipped error code is not possible when using a single-byte locale,
otherwise the user would not be able to type the character with
code 0xFF (although it could still be entered with Esc Esc 255).

This fixes https://savannah.gnu.org/bugs/?51477.

And reword them too, so that it is clearer what the mechanism is
for determining which syntax to use for a file.

Rename the corresponding rc-file option too, of course.

Color it bright green instead, like valid numeric arguments of
'fill' and 'tabsize'.  Also color the argument of 'formatter'.

And in the bargain improve some mark-up here and there.

And rewrap the feature toggles, so that a title does not start
a sentence.

And refer backward instead of forward.

I like it better that ^X stays in the same position compared to the
main screen: the lower left corner.

This fixes https://savannah.gnu.org/bugs/?51457.