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Basic Editing in Picture Mode
Most keys do the same thing in Picture mode that they usually do,
but do it in a quarter-plane style. For example, `C-f' is rebound to
run `picture-forward-column', which moves point one column to the
right, by inserting a space if necessary, so that the actual end of the
line makes no difference. `C-b' is rebound to run
`picture-backward-column', which always moves point left one column,
converting a tab to multiple spaces if necessary. `C-n' and `C-p' are
rebound to run `picture-move-down' and `picture-move-up', which can
either insert spaces or convert tabs as necessary to make sure that
point stays in exactly the same column. `C-e' runs
`picture-end-of-line', which moves to after the last non-blank
character on the line. There was no need to change `C-a', as the choice
of screen model does not affect beginnings of lines.
Insertion of text is adapted to the quarter-plane screen model
through the use of Overwrite mode (Note: Minor Modes.).
Self-inserting characters replace existing text, column by column,
rather than pushing existing text to the right. RET runs
`picture-newline', which just moves to the beginning of the following
line so that new text will replace that line.
Text is erased instead of deleted and killed. DEL
(`picture-backward-clear-column') replaces the preceding character with
a space rather than removing it. `C-d' (`picture-clear-column') does
the same in a forward direction. `C-k' (`picture-clear-line') really
kills the contents of lines, but never removes the newlines from a
To do actual insertion, you must use special commands. `C-o'
(`picture-open-line') creates a blank line, but does so after the
current line; it never splits a line. `C-M-o', `split-line', makes
sense in Picture mode, so it remains unchanged. LFD
(`picture-duplicate-line') inserts another line with the same contents
below the current line.
To actually delete parts of the picture, use `C-w', or with `C-c
C-d' (which is defined as `delete-char', as `C-d' is in other modes),
or with one of the picture rectangle commands (Note: Rectangles in
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