Function: kproperty:previous-single-change
kproperty:previous-single-change is a for
previous-single-property-change, defined in textprop.c.
Signature
(kproperty:previous-single-change POSITION PROP &optional OBJECT LIMIT)
Documentation
Return the position of previous property change for a specific property.
Scans characters backward from POSITION till it finds
a change in the PROP property, then returns the position of the change.
If the optional third argument OBJECT is a buffer (or nil, which means
the current buffer), POSITION is a buffer position (integer or marker).
If OBJECT is a string, POSITION is a 0-based index into it.
The property values are compared with eq.
Return nil if LIMIT is nil or omitted, and the property is constant all
the way to the start of OBJECT; if the value is non-nil, it is a position
less than POSITION, never equal.
If the optional fourth argument LIMIT is non-nil, don't search back past position LIMIT; return LIMIT if nothing is found until LIMIT.