Discovered during development of !156706.
Prior to 1561c1ea4a socket identifiers could (in rare cases) essentially be arbitrary names.
This is because in version `(2, 66, 2)` the socket names got copied to the identifiers.
But since 1561c1ea4a, socket identifiers are expected to be valid RNA identifiers.
This PR adds versioning code that sanitizes the socket identifiers.
Pull Request: https://projects.blender.org/blender/blender/pulls/157286
Since we are removing `scene.use_nodes` in #143578, most developers
will have to update their python script by replacing `scene.node_tree`
by `scene.compositing_node_group` in order to create a new compositing
node tree anyways. So we remove `scene.node_tree`.
Note: `scene->nodetree` in `scene_blend_write()` is still being written
to the blend file, so forward compatibility is not affected by this PR.
Pull Request: https://projects.blender.org/blender/blender/pulls/143619
This patch adds support for the Factor and Percentage subtypes for
vector sockets. This is needed by the compositor, since it has some node
inputs that specify locations and sizes relative to image size, and
having factor and percentage subtypes for those improves the UX quite a
bit according to user feedback.
Pull Request: https://projects.blender.org/blender/blender/pulls/138805
Loading pre-4.0.20 node groups with sockets using subtypes causes
broken socket identifiers. This is because the node tree interface now
expects sockets to use the base identifiers ("NodeSocketFloat" instead
of "NodeSocketFloatFactor" etc.).
To correct this the conversion code now replaces socket idnames that
include a subtype suffix with their base names. This fix is also applied
to files between versions 4.0.20 and 4.1.10, where the socket types
may have been converted incorrectly.
Pull Request: https://projects.blender.org/blender/blender/pulls/117133
