[PDFThumbnailView] Re-factor the canvas
to image
conversion such that we always render to a canvas
, and then replace it with an image
once rendering is done
#7029
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This is a follow-up to PRs #6299 and #6441.
The patch also adds an option to
PDFThumbnailView
, that disables the canvas-to-image conversion entirely, which might be useful in the context of issue #7026.