patch 8.0.1041: bogus characters when indenting during visual-block append

Problem:    Bogus characters appear when indenting kicks in while doing a
            visual-block append.
Solution:   Recompute when indenting is done. (Christian Brabandt)

src/proto/charset.pro

@@ -35,6 +35,8 @@ colnr_T getvcol_nolist(pos_T *posp);
 void getvvcol(win_T *wp, pos_T *pos, colnr_T *start, colnr_T *cursor, colnr_T *end);
 void getvcols(win_T *wp, pos_T *pos1, pos_T *pos2, colnr_T *left, colnr_T *right);
 char_u *skipwhite(char_u *q);
+int getwhitecols_curline(void);
+int getwhitecols(char_u *p);
 char_u *skipdigits(char_u *q);
 char_u *skipbin(char_u *q);
 char_u *skiphex(char_u *q);

src/proto/misc1.pro

@@ -1,4 +1,5 @@
 /* misc1.c */
+int get_whitespace_line_start(linenr_T lnum);
 int get_indent(void);
 int get_indent_lnum(linenr_T lnum);
 int get_indent_buf(buf_T *buf, linenr_T lnum);