Navigation: two internal errors with author intents

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难度
4/5
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3-5 天
新手友好度
52/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
rust
领域
accessibility, frontend

调研方向

Start by reading the navigation handling for MathML author intents and the relevant rules in navigate.yaml; the issue reports two reproducible failures in Enhanced mode and one in Simple mode. Reproduce the cases with the provided MathML, then trace how navigation resolves the intent-based nodes. Done when both cases navigate without internal errors while reading behavior remains intact.

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描述

Found while checking the spanish-mathml-intent test PDFs (#975 is a separate problem). Both happen in every language; examples in English, Enhanced mode.

1. A single token with an intent name. ZoomIn and then MoveNext:

<math><mi intent="greatest-common-divisor">gcd</mi></math>

ZoomIn gives "zoomed in to first character", and MoveNext gives "Internal Error: didn't find id/offset '…-literal-0', current_node_offset: 1 while attempting to start navigation". The same happens with _greatest-common-divisor. Reading is fine ("greatest common divisor").

2. A function whose head is itself an intent. Moving onto (f∘g)(x):

<math><mrow><mi>y</mi><mo>=</mo>
  <mrow intent="$c($a)">
    <mrow arg="c" intent="_composed-with:infix($f,$g)"><mi arg="f">f</mi><mo>∘</mo><mi arg="g">g</mi></mrow>
    <mo>(</mo><mi arg="a">x</mi><mo>)</mo>
  </mrow>
</mrow></math>

ZoomIn "y", MoveNext "is equal to", then MoveNext gives "Variable 'NavNode' set somewhere in navigate.yaml is nodeset and not an attribute: 0 nodes (false)". Same in Simple mode; Character mode works. Reading is fine ("y is equal to, f composed with g of x").

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