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display: don't draw more chunks than the screen can hold 

There is no need to always increase nrows by 1 or 2 -- an increase
of 1 is only needed when the line that borders on the scrolled region
needs to redrawn too: when this line was horizontally scrolled or when
the mark is on.

This fixes https://savannah.gnu.org/bugs/?50621.
Reported-by: David Lawrence Ramsey <pooka109@gmail.com>
master
David Lawrence Ramsey 2017-03-27 18:06:54 -05:00 committed by Benno Schulenberg
parent d01756bb69
commit 66ef8f45a3
1 changed files with 16 additions and 23 deletions
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37
src/winio.c
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@ -2902,14 +2902,10 @@ void edit_scroll(scroll_dir direction, int nrows)
/* Part 2: nrows is now the number of rows in the scrolled region of the
* edit window that we need to draw. */
/* If the scrolled region contains only one row, and the row before it is
* visible in the edit window, we need to draw it too. If the scrolled
* region is more than one row, and the rows before and after it are
* visible in the edit window, we need to draw them too. */
nrows += (nrows == 1) ? 1 : 2;
if (nrows > editwinrows)
nrows = editwinrows;
/* If we're not on the first "page" (when not softwrapping), or the mark
* is on, the row next to the scrolled region needs to be redrawn too. */
if (line_needs_update(openfile->placewewant, 0) && nrows < editwinrows)
nrows++;
/* If we scrolled up, we're on the line before the scrolled region. */
line = openfile->edittop;
@ -2919,20 +2915,17 @@ void edit_scroll(scroll_dir direction, int nrows)
if (direction == DOWNWARD)
go_forward_chunks(editwinrows - nrows, &line, &leftedge);
/* Draw new lines on any blank rows before or inside the scrolled region.
* If we're not in softwrap mode, we can optimize one case: if we scrolled
* forward and we're on the top row, or if we scrolled backward and we're
* on the bottom row, the row won't be blank, so we don't need to draw it
* unless the mark is on or we're not on the first "page". */
for (i = nrows; i > 0 && line != NULL; i--) {
if (!ISSET(SOFTWRAP) &&
((i == 1 && direction == UPWARD) ||
(i == nrows && direction == DOWNWARD))) {
if (line_needs_update(openfile->placewewant, 0))
update_line(line, (line == openfile->current) ?
openfile->current_x : 0);
} else
update_line(line, (line == openfile->current) ?
/* Draw new content on the blank rows inside the scrolled region
* (and on the bordering row too when it was deemed necessary). */
i = nrows;
while (i > 0 && line != NULL) {
#ifndef NANO_TINY
/* If the first blank row is in the middle of a softwrapped line,
* compensate for the earlier chunks of that line. */
if (ISSET(SOFTWRAP) && i == nrows)
i += strnlenpt(line->data, leftedge) / editwincols;
#endif
i -= update_line(line, (line == openfile->current) ?
openfile->current_x : 0);
line = line->next;
}