commit 156d3911952d73b03d7420dc3540215247db0fe8
author Bram Moolenaar <Bram@vim.org> Sat Jun 18 14:09:08 2022 +0100
committer Bram Moolenaar <Bram@vim.org> Sat Jun 18 14:09:08 2022 +0100
tree 49a05785c218ecab9cc97a621c8faf9e23d22267
parent 0e8e938d497260dd57be67b4966cb27a5f72376f

patch 8.2.5123: using invalid index when looking for spell suggestions

Problem:    Using invalid index when looking for spell suggestions.
Solution:   Do not decrement the index when it is zero.

src/spellsuggest.c

diff --git a/src/spellsuggest.c b/src/spellsuggest.c
index 5b460a3..8f97565 100644
--- a/src/spellsuggest.c
+++ b/src/spellsuggest.c
@@ -1973,7 +1973,8 @@
 			    sp->ts_isdiff = (newscore != 0)
 						       ? DIFF_YES : DIFF_NONE;
 			}
-			else if (sp->ts_isdiff == DIFF_INSERT)
+			else if (sp->ts_isdiff == DIFF_INSERT
+							    && sp->ts_fidx > 0)
 			    // When inserting trail bytes don't advance in the
 			    // bad word.
 			    --sp->ts_fidx;