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Point is not allowed to fall inside of an atomic extent. This has the effect
of making all text covered by an atomic extent be treated as a single object.
Normally point will be adjusted to an end of an atomic extent in the
direction of motion. If point appears inside of an atomic extent (via
goto-char for example), point will be adjusted to the side closest to
the entry point.
To make this feature available, add the following to your initialization file:
To make an extent atomic use the command:
(set-extent-property #<extent obj> 'atomic t)
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