fix(docx): preserve symbol checkbox states

[HanZephyr]

DOCX checkbox symbols stored as w:sym were dropped during parsing. In a table containing a checked option followed by an unchecked alternative, this left the alternative as bare text and changed how the content could be interpreted.

Map the supported Wingdings and Wingdings 2 checked/unchecked glyphs to Unicode, including their private-use encodings, while retaining run styling and text order. Unknown or malformed symbols keep the existing behavior. Tests use only synthetic in-memory documents.

Validation: cargo test --locked (299 passed, 1 ignored), cargo clippy --workspace --all-targets --all-features -- -D warnings, and cargo fmt --all --check. Regression tests fail before the fix and pass afterward.

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Summary by cubic

Fixes DOCX parsing so checkbox symbols stored as w:sym are preserved instead of dropped, which previously left unchecked options as bare text in tables.

Maps supported Wingdings and Wingdings 2 checked/unchecked glyphs to their Unicode equivalents, including private-use encodings, and retains run styling and text order. Rejects malformed or overlong character codes and keeps existing unsupported-symbol behavior for unknown font/code pairs.

^{Written for commit 2f0907d. Summary will update on new commits.}

[cubic-dev-ai]

1 issue found across 3 files

Confidence score: 4/5

• In src/formats/docx/mod.rs, malformed Wingdings w:char values such as +00A3 can be incorrectly emitted as checkboxes, producing inaccurate document output; validate the attribute contains only the permitted short hexadecimal digits before parsing.

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/formats/docx/mod.rs">

<violation number="1" location="src/formats/docx/mod.rs:9">
P2: When a Wingdings symbol has a malformed `w:char` such as `+00A3`, the new symbol parser still emits a checkbox. Validate that the attribute contains only the permitted short hexadecimal digits before parsing so malformed symbols keep the existing behavior.</violation>
</file>

<sub>Reply with feedback, questions, or to request a fix.

Fix all with cubic | Re-trigger cubic</sub>

[cubic-dev-ai]

P2: When a Wingdings symbol has a malformed w:char such as +00A3, the new symbol parser still emits a checkbox. Validate that the attribute contains only the permitted short hexadecimal digits before parsing so malformed symbols keep the existing behavior.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At src/formats/docx/mod.rs, line 9:

<comment>When a Wingdings symbol has a malformed `w:char` such as `+00A3`, the new symbol parser still emits a checkbox. Validate that the attribute contains only the permitted short hexadecimal digits before parsing so malformed symbols keep the existing behavior.</comment>

<file context>
@@ -6,6 +6,7 @@
 mod content;
 mod numbering;
 mod styles;
+mod symbols;
 
 use crate::error::ConvertError;
</file context>