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(elisp)Marker Insertion Types

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Marker Insertion Types
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   When you insert text directly at the place where a marker points,
there are two possible ways to relocate that marker: it can point before
the inserted text, or point after it.  You can specify which one a given
marker should do by setting its "insertion type".  Note that use of
`insert-before-markers' ignores markers' insertion types, always
relocating a marker to point after the inserted text.

 - Function: set-marker-insertion-type marker type
     This function sets the insertion type of marker MARKER to TYPE.
     If TYPE is `t', MARKER will advance when text is inserted at its
     position.  If TYPE is `nil', MARKER does not advance when text is
     inserted there.

 - Function: marker-insertion-type marker
     This function reports the current insertion type of MARKER.