Fix char signedness issue in bidi code

* src/dispextern.h (struct bidi_t): Change type of resolved_level
and isolate_level to signed char.  (Bug#22830)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 7d7d7305b43..00667c5a8fa 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -1973,8 +1973,8 @@ struct bidi_it {
                                    resolving weak and neutral types */
   bidi_type_t type_after_wn;    /* bidi type after overrides and Wn */
   bidi_type_t orig_type;        /* original bidi type, as found in the buffer */
-  char resolved_level;          /* final resolved level of this character */
-  char isolate_level;           /* count of isolate initiators unmatched by PDI */
+  signed char resolved_level;   /* final resolved level of this character */
+  signed char isolate_level;    /* count of isolate initiators unmatched by PDI */
   ptrdiff_t invalid_levels;     /* how many PDFs to ignore */
   ptrdiff_t invalid_isolates;   /* how many PDIs to ignore */
   struct bidi_saved_info prev;  /* info about previous character */