Fix `SyntaxError` indicator printing too many spaces for multi-line strings (GH-14433)

(cherry picked from commit 5b94f3578c662d5f1ee90c0e6b81481d9ec82d89)

Co-authored-by: Anthony Sottile <asottile@umich.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index c2ec659..31fe970 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -956,6 +956,7 @@ tok_nextc(struct tok_state *tok)
             while (!done) {
                 Py_ssize_t curstart = tok->start == NULL ? -1 :
                           tok->start - tok->buf;
+                Py_ssize_t cur_multi_line_start = tok->multi_line_start - tok->buf;
                 Py_ssize_t curvalid = tok->inp - tok->buf;
                 Py_ssize_t newsize = curvalid + BUFSIZ;
                 char *newbuf = tok->buf;
@@ -968,6 +969,7 @@ tok_nextc(struct tok_state *tok)
                 }
                 tok->buf = newbuf;
                 tok->cur = tok->buf + cur;
+                tok->multi_line_start = tok->buf + cur_multi_line_start;
                 tok->line_start = tok->cur;
                 tok->inp = tok->buf + curvalid;
                 tok->end = tok->buf + newsize;