A photo carrying EXIF GPS arrived with GPS WATERMARK already ON: adoptPhoto
set useGeotag to the presence of the position, so the file's own EXIF decided
to print a location. The stamp is the visitor's to ask for.
A new photo now opens with it OFF whatever the file carries; the position is
still read off the photo and is there the moment the chip is switched on by
hand (and the device-locate try for an EXIF-less frame is unchanged).
Verified in a real Chrome against the built bundle: a GPS photo opens OFF
with no hint, switching the chip ON reads back 'GPS read from the photo.'; a
no-GPS photo opens OFF and offers the manual entry.
3dtours
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