BOLD LOCK MODE

The file BOLD-LOCK.LISP contains code that enables the Bold Lock and Italic
Lock keys up at the top of the keyboard.  This file defines a ZMACS
minor-mode that looks at the Bold and Italic lock keys and sets the current
font appropriately.

If Bold Lock Mode is on in a buffer, the following behavior is exhibited:

o   Make the current font be the font which corresponds to the current font
    modified by the Bold and Italic lock keys - for example, if the current
    font was TR12, TR12b, TR12i, or TR12bi, and the Italic Lock key was lit
    but the Bold Lock key was not, then the resultant font would be TR12i.

o   If Bold Lock Mode attempts to make the current font be one which is not
    in the font list of the current buffer, the user is asked whether to add
    this font to the font list.  If the user replies no, then Bold Lock Mode
    will not ask again about that particular font - subsequent attempts to
    change to that font will be no-ops.

o   If both Bold Lock Mode and Electric Font-Lock Mode are on at the same
    time, the behavior is slightly different.  When Bold Lock Mode is
    determining the current font, it ``maximizes'' the facecode of the font -
    that is, if the current font is italic, but the Bold Lock key is lit
    and the Italic Lock key is not, then the resultant font will be
    Bold-Italic instead of simply Bold.

    Why?  Suppose the user has told Electric Font-Lock Mode that all
    docstrings are to be printed in the font TR12I.  If the interaction
    between Bold Lock Mode and Electric Font-Lock Mode was different, then
    unless the user always hit Italic Lock before typing docstrings,
    docstrings would come out in TR12 instead of the requested TR12i.

o   Also, if the user is typing in a docstring, and the docstring font is
    TR12i, the user may produce TR12bi merely by hitting the Bold Lock key.
    You turn this on by saying Meta-X Bold Lock Mode.