Julian Eisel
e90a2a3f01
For assets, the copy callback of the drop-box would append the asset data-block. Check if the operator's poll succeeds before calling the copy callback. Otherwise the data-block is "secretly" appended, which the user doesn't expect and won't notice without checking the file data in the Outliner. For masks I had to extend the poll function, it didn't check context sufficiently.
Sphinx Warnings
: WARNING: Could not obtain image size. :scale: option is ignored.
Note the preview is not accurate and warnings may not indicate real issues.
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