vim-patch:9.1.0184: Cursor pos wrong when clicking with conceal and wrap (#27890)

Problem:  Cursor position wrong when clicking with conceal and wrap.
Solution: Use the virtual column of the last char for ScreenCols[] in
          boguscols.  Remove use of MAXCOL in ScreenCols[].  Rename
          third argument of wlv_screen_line() to "clear_end" as that's
          clearer what it does (zeertzjq).

related: 14192
closes: vim/vim#14200

d0c1b7723f

Rename win_put_linebuf() to wlv_put_linebuf().

src/nvim/grid.h

@@ -27,8 +27,12 @@ EXTERN sattr_T *linebuf_attr INIT( = NULL);
 EXTERN colnr_T *linebuf_vcol INIT( = NULL);
 EXTERN char *linebuf_scratch INIT( = NULL);
 
-// Low-level functions to manipulate individual character cells on the
-// screen grid.
+/// flags for grid_put_linebuf()
+enum {
+  SLF_RIGHTLEFT = 1,
+  SLF_WRAP      = 2,
+  SLF_INC_VCOL  = 4,
+};
 
 /// Put a ASCII character in a screen cell.
 ///