Changed column calculations to use screen/virtual columns.

Movements where throw off because they work with screen columns, but not all
calculations were done using screen columns.

The plugin should now work as expected on lines with tabs, and also multibyte
characters.

Fixes #1

Author: coderifous

plugin/textobj/word-column.vim

@@ -3,10 +3,10 @@ if (exists("g:loaded_textobj_word_column"))
 endif
 
 function! TextObjWordBasedColumn(textobj)
-  let cursor_col = col(".")
+  let cursor_col = virtcol(".")
   exec "silent normal! v" . a:textobj . "\<Esc>"
-  let start_col       = col("'<")
-  let stop_col        = col("'>")
+  let start_col       = virtcol("'<")
+  let stop_col        = virtcol("'>")
   let line_num        = line(".")
   let indent_level    = s:indent_levell(".")
   let start_line      = s:find_boundary_row(line_num, start_col, indent_level, -1)
@@ -19,7 +19,7 @@ function! TextObjWordBasedColumn(textobj)
     let col_bounds = s:find_smart_boundary_cols(start_line, stop_line, cursor_col, a:textobj, whitespace_only)
   endif
 
-  exec "keepjumps silent normal!" . start_line . "gg" . col_bounds[0] . "|" stop_line . "gg" . col_bounds[1] . "|"
+  exec "keepjumps silent normal!" . start_line . "gg" . col_bounds[0] . "|" . stop_line . "gg" . col_bounds[1] . "|"
 endfunction
 
 function! s:find_smart_boundary_cols(start_line, stop_line, cursor_col, textobj, whitespace_only)
@@ -35,8 +35,8 @@ function! s:find_smart_boundary_cols(start_line, stop_line, cursor_col, textobj,
 
   while index <= a:stop_line
     exec "keepjumps silent normal!" index . "gg" . a:cursor_col . "|" . word_start . "v" . a:textobj . "\<Esc>"
-    let start_col  = col("'<")
-    let stop_col   = col("'>")
+    let start_col  = virtcol("'<")
+    let stop_col   = virtcol("'>")
     let col_bounds = s:col_bounds_fn(start_col, stop_col, col_bounds)
     let index      = index + 1
   endwhile
@@ -72,8 +72,10 @@ endfunction
 
 function! s:whitespace_column_wanted(start_line, stop_line, cursor_col)
   let index = a:start_line
+  let expanded_tabs = repeat(" ", &tabstop)
   while index <= a:stop_line
-    let char = getline(index)[a:cursor_col - 1]
+    let line = substitute(getline(index), "\t", expanded_tabs, "g")
+    let char = line[a:cursor_col - 1]
     if char != " " && char != "\t"
       return 0
     end