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[QTI] Answers that differ only in a formula or image are treated as the same answer #6301
Description
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Target branch: unstable
Observed behavior
richTextComparisonKey(QTIEditor/utils/richText.js) keys a fragment on its text alone whenever it has any text; formulas and images contribute none.<p>Solve <span data-latex="x^2"></span> for x</p>and<p>Solve <span data-latex="y^3"></span> for x</p>both key toSolve for x.- Match:
buildMatchInteractionXMLmerges two rows' answersx² is itandy³ is itinto one choice (match-max="2"); they³answer is lost on save (reported by @AlexVelezLl). - Associate:
buildAssociateInteractionXMLmerges choices on the same key. - Choice, ordering, match and associate validation flag such answers as duplicates.
User-facing consequences
- An author's match or associate answer is silently replaced by another row's answer.
- Valid single choice, multiple choice and ordering questions show a duplicate error and are marked incomplete.
Steps to reproduce
- Edit an exercise in a channel and add a single choice question in its QTI editor.
- Enter two options:
Solve, a formulax^2,for x; andSolve, a formulay^3,for x. - Both options show "Duplicate answer options are not allowed".
Acceptance Criteria
- Two fragments with the same text but different formulas (
data-latex) get different comparison keys. - Two fragments with the same text but different image
srcget different comparison keys. - Fragments that differ only in markup with no formula or image (e.g.
<strong>) still compare equal. - A match question whose rows have answers differing only in a formula saves and reopens with each row's own answer.
- An associate question whose choices differ only in a formula saves and reopens with both choices.
- Choice and ordering validation report no duplicate for options differing only in a formula or image.
AI usage
Drafted by Claude Code from @AlexVelezLl's review comment; the code paths were checked against unstable.
Activity
rtibblesbot commentedon Oct 7, 2026
Plan: Fragments with the same text but different formulas or images get different comparison keys, so match/associate stop merging them and validation stops flagging them (#6301).
Assumptions — the issue did not settle these; say so if one is wrong.
x² solve≠solve x²); if not, those two keys must be equal and the token goes after the text instead.srcalone; if alt or size should distinguish, match merges two such answers and keeps only the first one's alt and size.Written by rtibblesbot, an LLM-based coding agent.
fix(qti): key answers on their formulas and images, not text alone
rtibblesbot commentedon Oct 9, 2026
Superscript and subscript have the same problem: the comparison key reads
<sup>and<sub>as plain text.H<sub>2</sub>O,H<sup>2</sup>OandH2Oall get the same key, onunstableand on Tell QTI answers apart by their formulas and images #6302's branch.x<sup>2</sup>andx<sub>2</sub>are merged into one choice; only the first row's answer is saved.H, subscript2,OandH, superscript2,O. Both show "Duplicate answer options are not allowed".The AC "markup with no formula or image still compares equal" should exclude
<sup>/<sub>. Additional criteria:x<sup>2</sup>,x<sub>2</sub>andx2get three different comparison keys.x<sup>2</sup>andx<sub>2</sub>saves and reopens with each row's own answer.Written by rtibblesbot, an LLM-based coding agent.
fix(qti): key answers on their formulas, images and marks, not text a…
fix(qti): key answers on their formulas, images and marks, not text a…
fix(qti): key answers on their formulas, images and marks, not text a…