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scrolling: properly compensate for the onscreen chunks 

If edittop is partially offscreen before we scroll, and it gets
scrolled more offscreen, we do need to compensate for the chunks
between firstcolumn and leftedge -- that is: the chunks between
the top row and the cursor row.

This fixes https://savannah.gnu.org/bugs/?50691.
master
David Lawrence Ramsey 2017-04-01 14:32:59 -05:00 committed by Benno Schulenberg
parent c3830517cc
commit f9a8d6ff4e
1 changed files with 6 additions and 4 deletions
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10
src/winio.c
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@ -2920,10 +2920,12 @@ void edit_scroll(scroll_dir direction, int nrows)
go_forward_chunks(editwinrows - nrows, &line, &leftedge); go_forward_chunks(editwinrows - nrows, &line, &leftedge);
#ifndef NANO_TINY #ifndef NANO_TINY
/* Compensate for the earlier onscreen chunks of a softwrapped line /* Compensate for the earlier chunks of a softwrapped line. */
* when the first blank row happens to be in the middle of that line. */ nrows += leftedge / editwincols;
if (ISSET(SOFTWRAP) && line != openfile->edittop)
nrows += leftedge / editwincols; /* Don't compensate for the chunks that are offscreen. */
if (line == openfile->edittop)
nrows -= openfile->firstcolumn / editwincols;
#endif #endif
/* Draw new content on the blank rows inside the scrolled region /* Draw new content on the blank rows inside the scrolled region