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Commands `column-marker-1', `column-marker-2', and
`column-marker-3' each highlight a given column (using different
background colors, by default).
- With no prefix argument, each highlights the current column
(where the cursor is).
- With a non-negative numeric prefix argument, each highlights that
column.
- With plain `C-u' (no number), each turns off its highlighting.
- With `C-u C-u', each turns off all column highlighting.
If two commands highlight the same column, the last-issued
highlighting command shadows the other - only the last-issued
highlighting is seen. If that "topmost" highlighting is then
turned off, the other highlighting for that column then shows
through.
Examples:
M-x column-marker-1 highlights the column where the cursor is, in
face `column-marker-1'.
C-u 70 M-x column-marker-2 highlights column 70 in face
`column-marker-2'.
C-u 70 M-x column-marker-3 highlights column 70 in face
`column-marker-3'. The face `column-marker-2' highlighting no
longer shows.
C-u M-x column-marker-3 turns off highlighting for column-marker-3,
so face `column-marker-2' highlighting shows again for column 70.
C-u C-u M-x column-marker-1 (or -2 or -3) erases all column
highlighting.
These commands use `font-lock-fontify-buffer', so syntax
highlighting (`font-lock-mode') must be turned on. There might be
a performance impact during refontification.
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