(compute_motion): Call strwidth only when necessary.

Set wide_column_end_hpos only when MULTIBYTE_BYTES_WIDTH set
nonzero to wide_column.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/indent.c b/src/indent.c
index bd09008104c..2811fbde7b7 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -1104,7 +1104,8 @@ compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width,
             {
               unsigned char *ovstr;
               int ovlen = overlay_strings (pos, win, &ovstr);
-              hpos += (multibyte ? strwidth (ovstr, ovlen) : ovlen);
+              hpos += ((multibyte && ovlen > 0)
+                       ? strwidth (ovstr, ovlen) : ovlen);
             }
           did_motion = 0;
 
@@ -1450,7 +1451,8 @@ compute_motion (from, fromvpos, fromhpos, did_motion, to, tovpos, tohpos, width,
               ptr = BYTE_POS_ADDR (pos_byte);
               MULTIBYTE_BYTES_WIDTH (ptr, c, dp);
               pos_byte += bytes;
-              wide_column_end_hpos = hpos + wide_column;
+              if (wide_column)
+                wide_column_end_hpos = hpos + wide_column;
               hpos += width;
             }
           else