For starters, your description is a little confusing: you
have a 800 (wide) by 600 (tall) frame, and you place a
canvas inside this, with a max size of 300 x 300 (possibly
smaller on one or both axes, depending on the GIF to be loaded),
you have a mandatory scrollbar at the bottom of the canvas,
and an optional one along the right side. Then, you say
that you load a 200 x 700 image, which should mean 200 wide,
700 tall, and you say that you don't get the side scroll
bar, which is what you expected. (?? -- Did you really mean
that the image is 700 x 200? What happens when you load
an image that needs the vertical scrollbar?)
Anyway, I gather that the bottom scrollbar is spanning the
full width of the frame that contains the canvas (800 wide),
which certainly seems wrong -- although you say it actually
does scroll the image as intended when you click on its various
elements.
I don't have a direct answer
to the sizing problem, but I would point out that you could
(probably should) combine the two "-scrollbars" parameters
into one: -scrollbars => 'sow', -- sorry if
that turns out to be off the mark... Apart from that, have
you confirmed that the "$height" and "$width" variables
actually have the expected values (as opposed to, say, zero
or undef)?
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