Commit 919ddce7 authored by Ell's avatar Ell

app: speed up layer-group preview rendering

In gimp_drawable_get_sub_preview_async(), when the drawable buffer
has a validate handler (i.e., when the drawable is a group layer),
validate the requested area before calling gegl_buffer_get(), so
that the buffer is validated in a single step, instead of tile-by-
parent faf6acfb
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