fix: preserve keyboard operators during input cleanup

[JWWTSL]

Normalize keyboard operators before separator formatting so transient ASCII operators are not dropped during text cleanup.

Keep the current operator when applying point fault tolerance to the right side of an expression.

Summary by Sourcery

Preserve keyboard-entered arithmetic operators during input normalization and point fault tolerance so expressions retain their intended operators.

Bug Fixes:

• Ensure transient ASCII arithmetic operators are converted to normalized symbols before separator formatting to prevent them being dropped during text cleanup.
• Maintain the operator character when applying point fault tolerance by only fault-tolerancing the left and right operands around it.

Enhancements:

• Allow both normalized and ASCII arithmetic operators in the set of permitted input characters to better support different keyboard layouts.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR adjusts input normalization and fault-tolerance logic so keyboard-entered ASCII and full‑width operators are preserved and normalized consistently, and point fault tolerance on expressions does not overwrite the operator at the split point.

Sequence diagram for updated input normalization and point fault tolerance

sequenceDiagram
  actor User
  participant InputEdit
  participant ExpressionBar

  User->>InputEdit: handleTextChanged(text)
  InputEdit->>InputEdit: normalize decimal separator
  InputEdit->>InputEdit: replace ASCII/fullwidth operators
  InputEdit->>InputEdit: filter with allowedStatic

  User->>ExpressionBar: pointFaultTolerance(text)
  ExpressionBar->>ExpressionBar: split leftitem, rightitem at operator
  ExpressionBar->>InputEdit: symbolFaultTolerance(leftitem)
  ExpressionBar->>ExpressionBar: replace left side
  ExpressionBar->>InputEdit: symbolFaultTolerance(rightitem)
  ExpressionBar->>ExpressionBar: replace right side [operator preserved]
  ExpressionBar-->>User: result

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File-Level Changes

Change	Details	Files
Normalize keyboard and full-width operators earlier in the text-change pipeline and expand the set of allowed operator characters so transient ASCII operators are not dropped during cleanup.	Add an initial normalization step on the raw expression string to convert ASCII and full-width operators and parentheses to their canonical internal forms before logging and further processing. Extend later normalization of arithmetic input to also convert '/' and full-width slash to the canonical division symbol and keep mapping for other operators and parentheses. Broaden the allowed character set for filtering to include both canonical and ASCII forms of arithmetic operators so they are not removed during cleanup.	src/widgets/inputedit.cpp
Adjust point fault tolerance splitting and replacement indices so that operator characters at the split position are preserved while applying fault tolerance to left and right sub-expressions.	Change the right-hand substring for fault tolerance to start after the operator character at the split index instead of including it. Update the replacement ranges for left and right substrings to avoid overwriting the operator at the split point when applying symbol fault tolerance.	src/widgets/expressionbar.cpp

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[sourcery-ai]

Hey - I've left some high level feedback:

• The operator normalization logic (full-width/ASCII variants for +, -, *, /, parentheses, etc.) is duplicated and slightly diverging between normalizedExpr and reformatStr; consider extracting this into a shared helper to keep behavior consistent and easier to maintain.
• The allowedStatic string now includes both normalized and raw operator forms (＋－×÷+-*/); double-check that this set matches the intended normalization pipeline and that operators aren’t unintentionally allowed or disallowed at different stages.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The operator normalization logic (full-width/ASCII variants for +, -, *, /, parentheses, etc.) is duplicated and slightly diverging between `normalizedExpr` and `reformatStr`; consider extracting this into a shared helper to keep behavior consistent and easier to maintain.
- The `allowedStatic` string now includes both normalized and raw operator forms (`＋－×÷+-*/`); double-check that this set matches the intended normalization pipeline and that operators aren’t unintentionally allowed or disallowed at different stages.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: JWWTSL, lzwind

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