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Previously, built-in XBlocks (problem, video, vertical, etc.) could be
imported and exported using pointer-tag OLX syntax, but externally-defined
XBlocks (e.g. drag-and-drop-v2, lti_consumer, ORA) could only be imported
inline. Pointer-tag handling lived exclusively on XmlMixin, which is not
inherited by external blocks and is deliberately excluded from
settings.XBLOCK_MIXINS.
Move pointer-tag resolution out of XmlMixin and into two single
chokepoints on XMLParsingModuleStoreRuntime:
* xblock_from_node: detect is_pointer_tag and load the referenced file
before dispatching to parse_xml, but only when the target class does
not already inherit XmlMixin (to preserve existing behavior and
avoid double file reads).
* add_block_as_child_node: when exporting a non-XmlMixin block, write
its definition to a separate file and leave a pointer tag in the
parent, matching the export format used by built-in blocks.
This supersedes the per-container approach in the reverted PR #37133,
which missed import paths outside of vertical/split_test/item_bank/
conditional and did not address the export side at all.
Closes #36390
kingoftech-v01
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