Re: doc problems with defcustom

[Richard Stallman]

    There are some defcustom variables which have no (or incorrect) effect
    if you set them with setq -- such variables typically have a :set
    action which must be called for the setting to take effect.

    For example pc-selection-mode and global-reveal-mode.

In such cases, the variable's doc string should always say so.
We should try to minimize the number of such cases.