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moving: don't try to redraw lines that have gone outside the viewport 

When scrolling backward, it is not just the bottom line of the screen
that doesn't need to be redrawn: also the line /before/ the top line
doesn't need a redraw.  Mutatis mutandis for scrolling forward.

This fixes https://savannah.gnu.org/bugs/?50657.
master
Benno Schulenberg 2017-03-27 19:39:10 +02:00
parent 244a503ddc
commit 9cf980700c
1 changed files with 2 additions and 2 deletions
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4
src/move.c
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@ -489,7 +489,7 @@ void do_up(bool scroll_only)
1 : editwinrows / 2 + 1); 1 : editwinrows / 2 + 1);
/* If the lines weren't already redrawn, see if they need to be. */ /* If the lines weren't already redrawn, see if they need to be. */
if (openfile->current_y > 0) { if (openfile->current_y > 0 && openfile->current_y < editwinrows - 1) {
/* Redraw the prior line if it's not actually the same line as the /* Redraw the prior line if it's not actually the same line as the
* current one (which it might be in softwrap mode, if we moved just * current one (which it might be in softwrap mode, if we moved just
* one chunk) and the line was horizontally scrolled. */ * one chunk) and the line was horizontally scrolled. */
@ -545,7 +545,7 @@ void do_down(bool scroll_only)
1 : editwinrows / 2 + 1); 1 : editwinrows / 2 + 1);
/* If the lines weren't already redrawn, see if they need to be. */ /* If the lines weren't already redrawn, see if they need to be. */
if (openfile->current_y < editwinrows - 1) { if (openfile->current_y > 0 && openfile->current_y < editwinrows - 1) {
/* Redraw the prior line if it's not actually the same line as the /* Redraw the prior line if it's not actually the same line as the
* current one (which it might be in softwrap mode, if we moved just * current one (which it might be in softwrap mode, if we moved just
* one chunk) and the line was horizontally scrolled. */ * one chunk) and the line was horizontally scrolled. */