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It is not easy to display a value of point in the middle of a
sequence of text that has the display, composition or
is invisible. Therefore, after a command finishes and returns to the
command loop, if point is within such a sequence, the command loop
normally moves point to the edge of the sequence.
A command can inhibit this feature by setting the variable
disable-point-adjustment:
If this variable is non-nil when a command returns to the
command loop, then the command loop does not check for those text
properties, and does not move point out of sequences that have them.
The command loop sets this variable to nil before each command,
so if a command sets it, the effect applies only to that command.
If you set this variable to a non-nil value, the feature of
moving point out of these sequences is completely turned off.