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guix/gnu/packages/patches/rxvt-unicode-fix-cursor-pos...

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Fix a bug that causes the cursor position to be incorrect when opening
new terminals:
http://lists.schmorp.de/pipermail/rxvt-unicode/2023q1/002639.html
https://bugs.archlinux.org/task/77062
https://gitlab.alpinelinux.org/alpine/aports/-/issues/14525
This patches reverts all changes made to 'src/screen.C' in rxvt-unicode 9.31.
--- rxvt-unicode-9.31/src/screen.C 2022-08-08 06:33:08.000000000 -0400
+++ rxvt-unicode-9.30/src/screen.C 2021-07-02 23:55:47.000000000 -0400
@@ -293,7 +293,6 @@
int common_col = min (prev_ncol, ncol);
- // resize swap_buf, blank drawn_buf
for (int row = min (nrow, prev_nrow); row--; )
{
scr_blank_screen_mem (drawn_buf [row], DEFAULT_RSTYLE);
@@ -307,7 +306,6 @@
int pend = MOD (term_start + top_row , prev_total_rows);
int q = total_rows; // rewrapped row
-#if ENABLE_FRILLS
if ((rewrap_always || top_row) && !rewrap_never)
{
// Re-wrap lines. This is rather ugly, possibly because I am too dumb
@@ -389,35 +387,36 @@
scr_blank_line (*qline, qline->l, ncol - qline->l, DEFAULT_RSTYLE);
}
while (p != pend && q > 0);
+
+ term_start = total_rows - nrow;
+ top_row = q - term_start;
+
+ // make sure all terminal lines exist
+ while (top_row > 0)
+ scr_blank_screen_mem (ROW (--top_row), DEFAULT_RSTYLE);
}
else
-#endif
{
- // wing, instead of wrap
- screen.cur.row += nrow - prev_nrow;
+ // if no scrollback exists (yet), wing, instead of wrap
- do
+ for (int row = min (nrow, prev_nrow); row--; )
{
- p = MOD (p - 1, prev_total_rows);
- q--;
+ line_t &src = prev_row_buf [MOD (term_start + row, prev_total_rows)];
+ line_t &dst = row_buf [row];
- copy_line (row_buf [q], prev_row_buf [p]);
+ copy_line (dst, src);
}
- while (p != pend && q > 0);
- }
- term_start = total_rows - nrow;
- top_row = q - term_start;
+ for (int row = prev_nrow; row < nrow; row++)
+ scr_blank_screen_mem (row_buf [row], DEFAULT_RSTYLE);
- // make sure all terminal lines exist
- while (top_row > 0)
- scr_blank_screen_mem (ROW (--top_row), DEFAULT_RSTYLE);
+ term_start = 0;
+ }
clamp_it (screen.cur.row, 0, nrow - 1);
clamp_it (screen.cur.col, 0, ncol - 1);
}
- // ensure drawn_buf, swap_buf and terminal rows are all initialized
for (int row = nrow; row--; )
{
if (!ROW (row).valid ()) scr_blank_screen_mem (ROW (row), DEFAULT_RSTYLE);