[Refactor] Slash-n-Burn LTI BuiltIn XBlock

[irfanuddinahmad]

See parent epic: openedx/openedx-platform#37819

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Rollout Position

Step 5 of 8 — Medium-high complexity (~1,386 LOC core). The LTI block coexists with a separate LTI Provider Django app and LTI course tab feature — these are out of scope and remain in edx-platform after this removal.

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Block Details

Toggle	USE_EXTRACTED_LTI_BLOCK in openedx/envs/common.py
Shim class	_BuiltInLTIBlock in xmodule/lti_block.py
Entrypoint	lti = "xmodule.lti_block:LTIBlock" in pyproject.toml

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Checklist

Pre-condition

• Review PRs merged into the built-in LTI XBlock code in edx-platform after the extraction work was done — port any bug fixes or improvements to xblocks-contrib if not already there.

Steps (single PR)

• Remove the toggle — delete USE_EXTRACTED_LTI_BLOCK from openedx/envs/common.py and all usages.
• Remove the shim — delete _BuiltInLTIBlock class and the from xblocks_contrib.lti import LTIBlock as _ExtractedLTIBlock import from xmodule/lti_block.py.
• Remove the entrypoint — delete lti = "xmodule.lti_block:LTIBlock" from pyproject.toml.
• Remove remaining assets:
  • xmodule/lti_block.py (Python class)
  • xmodule/lti_2_util.py
  • xmodule/js/src/lti/lti.js (JavaScript)
  • lms/templates/lti.html and lms/templates/lti_form.html (templates)
  • xmodule/static/css-builtin-blocks/LTIBlockDisplay.css (CSS)
  • Webpack entries LTIBlockDisplay / LTIBlockEditor in webpack.builtinblocks.config.js
• Run smoke tests on the extracted LTI block to verify nothing is broken.

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Scope Notes

Out of scope for this issue:

• lms/djangoapps/lti_provider/ — separate Django app handling LTI protocol OAuth callbacks and grade passback; remains in edx-platform.
• openedx/features/lti_course_tab/ — LTI course tab feature; remains in edx-platform.

[irfanuddinahmad]

Implementation PR: openedx/openedx-platform#38747