in break_line(), fix another problem where goal could be miscalculated

on lines containing tabs


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3026 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -317,8 +317,9 @@ CVS code -
   do_enter()
 	- Don't update the edit window until we set placewewant. (DLR)
   break_line()
-	- Fix a problem where a line could be broken in the middle of
-	  a multibyte character. (DLR)
+	- Fix problems where a line could be broken in the middle of
+	  a multibyte character, and goal could be miscalculated on lines
+	  containing tabs. (DLR)
   do_word_count()
 	- Rename to do_wordlinechar_count(), and expand to also count
 	  the number of lines and characters in the file or selection,

src/text.c

@@ -570,12 +570,16 @@ ssize_t break_line(const char *line, ssize_t goal, bool newline)
 	 * found with short enough display width.  */
     ssize_t cur_loc = 0;
 	/* Current index in line. */
+    size_t pos = 0;
+	/* Current column position in line. */
+    size_t old_pos;
+	/* Previous column position in line. */
     int line_len;
 
     assert(line != NULL);
 
     while (*line != '\0' && goal >= 0) {
-	size_t pos = 0;
+	old_pos = pos;
 
 	line_len = parse_mbchar(line, NULL, &pos);
 
@@ -586,7 +590,7 @@ ssize_t break_line(const char *line, ssize_t goal, bool newline)
 		break;
 	}
 
-	goal -= pos;
+	goal -= pos - old_pos;
 	line += line_len;
 	cur_loc += line_len;
     }