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Update invisible/intangible handling spec.

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This commit is contained in:
Richard M. Stallman 2003-04-26 02:56:41 +00:00
parent acf8889775
commit f10b84c8bd
1 changed files with 15 additions and 5 deletions
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20
etc/NEWS
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@ -1876,16 +1876,26 @@ image or composition property.
** Only one of the beginning or end of an invisible, intangible region is
considered an acceptable value for point; which one is determined by
examining how the invisible/intangible properties are inherited when new
text is inserted adjacent to them. If text inserted at the beginning would
inherit the invisible/intangible properties, then that position is
considered unacceptable, and point is forced to the position following the
invisible/intangible text. If text inserted at the end would inherit the
properties, then the opposite happens.
text is inserted adjacent to them. (The `front-sticky' and `rear-sticky'
properties control this.)
If the invisible/intangible would be inherited by any text inserted
before this region, then the position before it is considered
unacceptable, and point is forced to continue (if moving forwards, to
the position following the invisible/intangible text; if moving
backwards, to one position before). If the properties would be
inherited by any text inserted after, then the position after is
considered unacceptable, and point is forced to keep moving (if moving
backwards, to the position preceding the invisible/intangible text; if
moving forwards, to one position later).
Thus, point can only go to one end of an invisible, intangible region, but
not the other one. This prevents C-f and C-b from appearing to stand still
on the screen.
You should not set it up so that both the position before and the position
after are unacceptable.
** field-beginning and field-end now accept an additional optional
argument, LIMIT.