FIX: Do not extend to lines that are shorter than the start column.

With the cursor on "ab", I get an invalid selection that extends to the "." of the second line (and a beep when smart boundaries are used), instead of the expected selection of lines 3 + 4.

" Use real visual mode mappings to avoid the mapping delay when entering visual
" mode with "v".
xnoremap <silent> ab :<C-u>call TextObjWordBasedColumn("aw")<cr>
xnoremap <silent> aB :<C-u>call TextObjWordBasedColumn("aW")<cr>

This can be fixed by checking that there's actually a character at the start virtual column. The match for the exact column number also ensures that if the position is inside a Tab or in the middle of a double-width character, the selection will not be extended.

Author: inkarkat

plugin/textobj/word-column.vim

@@ -94,8 +94,9 @@ function! s:find_boundary_row(start_line, start_col, indent_level, step)
     let next_line      = current_line + a:step
     let non_blank      = getline(next_line) =~ "[^ \t]"
     let same_indent    = s:indent_level(next_line) == a:indent_level
+    let has_width      = getline(next_line) =~ '\%'.a:start_col.'v'
     let is_not_comment = ! s:is_comment(next_line, a:start_col)
-    if same_indent && non_blank && is_not_comment
+    if same_indent && non_blank && has_width && is_not_comment
       let current_line = next_line
     else
       return current_line