* M8: one depth cap for a whole render; render threads get 8 MiB stacks (#1082)
A pattern fill drew its source as a fresh render from depth 0, so patterns in patterns could stack three renders of 256 levels. The source now goes on from the depth of the layer it fills. A render level takes about 6.5 KB of stack (measured), about 1.7 MB at the cap: the canvas render, preview and save threads and a band pool of their own now get 8 MiB stacks instead of the default 2 MiB.
* M8: SVG and PDF exports carry the depth into pattern sources and embedded renders (#1082)
BFlat
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