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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
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
nilwhen a command returns to the command loop, then the command loop does not check for text properties such as
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.
nilvalue, the feature of moving point out of these sequences is completely turned off.
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