When softwrapping with a tabsize larger than the width of the viewport,
scrolling one row when the cursor goes offscreen might not be enough,
so in that case use edit_redraw() instead.
This fixes https://savannah.gnu.org/bugs/?65860.
Bug existed since version 2.9.6, commit 0d9080a2.
Also, elide an unneeded condition: when not softwrapping, left_x will
be zero, which is always smaller than or equal to the indentation.
Furthermore, reshuffle a few lines, improve three comments, and adjust
one to mention the parameter that was added in the previous commit.
This adjusts the main softwrapping routine so that it remembers the
reached point in a line's text and the corresponding column. This
avoids having to scan the line from the beginning for each iterative
call, and thus saves a substantial amount of time when softwrapping
very long lines.
This mitigates https://savannah.gnu.org/bugs/?62442.
Reported-by: Devin Hussey <husseydevin@gmail.com>
Original-patch-by: Devin Hussey <husseydevin@gmail.com>
When making a forward movement larger than a screenful, we cannot rely
on the multidata of the line before the new screen start to have been
set correctly by a previous screen drawing, so we need to recompute all
of the multidata, for the whole buffer, so that afterward we can freely
move around and draw the screen without having to do any backtracking.
Also when a piece of text larger than a screenful is pasted or inserted,
all the multidata needs to be recomputed.
This fixes https://savannah.gnu.org/bugs/?60041,
and fixes https://savannah.gnu.org/bugs/?62056.
First bug existed in this form since version 2.4.2, commit d49c267f
(but editing Python was incomparably slower in those days).
Second bug existed since version 5.6, commit 43d94692.
This makes the cursor move smoothly left and right -- instead of
"stuttering" when passing over a zero-width character.
Pressing <Delete> on a normal (spacing) character also deletes
any zero-width characters after it. But pressing <Backspace>
while the cursor is placed after a zero-width character, just
deletes that zero-width character. The latter behavior allows
deleting and retyping just the combining diacritic of a character
instead of the whole character.
This addresses https://savannah.gnu.org/bugs/?50773.
Requested-by: Mike Frysinger <vapier@gentoo.org>
Just like <Ctrl+Down> goes to the end of the buffer when after the
cursor there are only blank lines.
This fixes https://savannah.gnu.org/bugs/?58921.
Bug existed since version 2.6.2, since <Ctrl+Up/Down> were introduced.
By default, this function is bound to ^L, to make that keystroke do
something actually useful. To not lose the Refresh function that this
keystroke had, the centering function additionally does a full redraw
and refresh of the screen.
Now all functions that are relevant only to softwrapping
get called only when softwrapping is on.
This also allows to elide an intermediate function call.
Keeping the invisible cursor at the left edge avoids any line getting
scrolled horizontally.
This fixes https://savannah.gnu.org/bugs/?57991.
Bug existed since version 2.8.2, since the help texts got generated
and displayed in a different way in order to become searchable.
If the edit window consists of a single row, then the do_down() call
has already brought the desired line or chunk into view -- no attempt
should then be made to scroll the screen further.
This fixes https://savannah.gnu.org/bugs/?56553.
Bug existed since version 2.9.6, commit 0d9080a2.
Not stepping beyond the last line of the paragraph means that the
length of the paragraph is always the difference in line numbers
(between first and last line of the paragraph) plus one.
The functions do_para_begin() and do_para_end() can now move through any
buffer, while the functions do_para_begin_void() and do_para_end_void()
operate on the current buffer. The latter function also returns TRUE
if the last line in the buffer is part of the paragraph.
If the edit window consists of a single row, then the do_up() call has
already brought the desired line into view -- which means that trying
to scroll then (when already on the first line of the file) would fail.
This fixes https://savannah.gnu.org/bugs/?53891.
Benno Schulenberg