Moves the gap and adjusts its size in anticipation of a text change.
The gap is resized to actual size + the specified size and moved to the given
position.
<p>
@param position the position at which a change is occurring
@param size the size of the change
@param newGapLine the line where the gap should be put
Moves the gap and adjusts its size in anticipation of a text change. The gap is resized to actual size + the specified size and moved to the given position. <p>
@param position the position at which a change is occurring @param size the size of the change @param newGapLine the line where the gap should be put