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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 or composition property. So
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:
nil when a command returns to the command
loop, then the command loop does not check for text properties such as
display and composition, and does not move point out of
sequences that have these properties.
The command loop sets this variable to nil before each command,
so if a command sets it, the effect applies only to that command.
nil value, the feature of
moving point out of these sequences is completely turned off.