patch 8.2.4762: using freed memory using synstack() and synID() in WinEnter
Problem: Using freed memory when using synstack() and synID() in WinEnter.
Solution: Check using the syntax window. (closes #10204)
diff --git a/src/syntax.c b/src/syntax.c
index 086d9d7..6b71e8d 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -6486,8 +6486,9 @@
int keep_state) // keep state of char at "col"
{
// When the position is not after the current position and in the same
- // line of the same buffer, need to restart parsing.
- if (wp->w_buffer != syn_buf
+ // line of the same window with the same buffer, need to restart parsing.
+ if (wp != syn_win
+ || wp->w_buffer != syn_buf
|| lnum != current_lnum
|| col < current_col)
syntax_start(wp, lnum);