577c46c081
Blender crashes in older versions when loading files saved from v4.5 and contain nodes like Mix in the compositor. That's because those nodes do not exist in older versions, that is, this is a forward compatibility issue. The compositor already has protections in place to not crash when loading files from future versions containing new nodes. However, for nodes like Mix which existed in other node trees, the node is not new, it is just new to the compositor, so it goes undetected and the compositor tries to execute it leading to a crash. To fix this, we also check the poll method of the node when verifying compositor node trees. This should be backported to the corrective release, as well as LTSs. But for v4.5, a change will later follow to make the compositor execute such undefined/unsupported nodes using a default operation that initializes the output with default values. Pull Request: https://projects.blender.org/blender/blender/pulls/136438
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