Return the clipping begin position as a source position.
The begin position of the current clipped view in the source.
In the following gaps configuration, the result of
beginPosition(gaps) is 1.
The clipping starts in a gap and the source position of the first non-gap character right of the clipping begin has source position 1.
gapped sequence: X--XXX-XX-
source position: 0111234456
unclipped view position: 0123456789
clipped view position: 0123456
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