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scrolling: don't bother to limit the number of lines to step back

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The go_back_chunks() function will do this clipping.

This fixes https://savannah.gnu.org/bugs/?50866.
This commit is contained in:
Benno Schulenberg 2017-04-24 19:44:51 +02:00
parent ac1444578c
commit 861d81edba
1 changed files with 10 additions and 24 deletions
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34
src/winio.c
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@ -3093,37 +3093,23 @@ void edit_refresh(void)
refresh_needed = FALSE; refresh_needed = FALSE;
} }
/* Move edittop so that current is on the screen. manner says how it /* Move edittop so that current is on the screen. manner says how:
* should be moved: CENTERING means that current should end up in the * STATIONARY means that the cursor should stay on the same screen row,
* middle of the screen, STATIONARY means that it should stay at the * CENTERING means that current should end up in the middle of the screen,
* same vertical position, and FLOWING means that it should scroll no * and FLOWING means that it should scroll no more than needed to bring
* more than needed to bring current into view. */ * current into view. */
void adjust_viewport(update_type manner) void adjust_viewport(update_type manner)
{ {
int goal = 0; int goal = 0;
/* If manner is CENTERING, move edittop half the number of window rows if (manner == STATIONARY)
* back from current. If manner is FLOWING, move edittop back 0 rows
* or (editwinrows - 1) rows, depending on where current has moved.
* This puts the cursor on the first or the last row. If manner is
* STATIONARY, move edittop back current_y rows if current_y is in range
* of the screen, 0 rows if current_y is below zero, or (editwinrows - 1)
* rows if current_y is too big. This puts current at the same place on
* the screen as before, or... at some undefined place. */
if (manner == CENTERING)
goal = editwinrows / 2;
else if (manner == FLOWING) {
if (!current_is_above_screen())
goal = editwinrows - 1;
} else {
goal = openfile->current_y; goal = openfile->current_y;
else if (manner == CENTERING)
if (goal > editwinrows - 1) goal = editwinrows / 2;
statusline(ALERT, "Row is out of range -- please report a bug"); else if (!current_is_above_screen())
} goal = editwinrows - 1;
openfile->edittop = openfile->current; openfile->edittop = openfile->current;
#ifndef NANO_TINY #ifndef NANO_TINY
if (ISSET(SOFTWRAP)) if (ISSET(SOFTWRAP))
openfile->firstcolumn = (xplustabs() / editwincols) * editwincols; openfile->firstcolumn = (xplustabs() / editwincols) * editwincols;