fix(test): resolve ASAN heap-buffer-overflow in textedit unit tests

[pengfeixx]

Add stubs for insertMultiTextEx, deleteMultiTextEx and slotCanUndoChanged to prevent unsafe Window pointer access via EditWrapper::window() when no real Window parent exists.

修复单元测试中因 EditWrapper 缺少 Window 父对象导致的堆越界崩溃，
通过 stub 隔离 undo 栈信号链中的 Window 访问路径。

同时修复源码中 slotCanUndoChanged/slotCanRedoChanged 的空指针 解引用风险，使用 dynamic_cast 替代直接调用，增加 m_wrapper 空检查。
修复 Tabbar::eventFilter 事件过滤范围过宽的问题。
修复 Qt6 API 兼容性（QMouseEvent/QHoverEvent 构造函数变更）。
修复 resizeEvent lambda 中的悬空指针风险（使用 QPointer 保护）。
修复 Window::checkBlockShutdown 空标签文本的越界访问。

Log: 修复单元测试ASAN堆越界崩溃及多处空指针/类型安全问题
Influence: 修复后单元测试不再因类型混淆和堆越界崩溃，提升测试稳定性；源码修复消除了 slotCanUndoChanged 等路径中的空指针解引用和悬空指针风险。

Summary by Sourcery

Fix text editor tests and core components to address ASAN heap-buffer-overflow, null-pointer risks, and Qt6 API compatibility issues.

Bug Fixes:

• Prevent unsafe access to EditWrapper::window() in unit tests by stubbing multi-text insertion/deletion and undo-related slots.
• Guard TextEdit undo/redo handlers and text-changed callbacks against null wrappers and non-Window parents, avoiding null dereferences and type confusion.
• Avoid dangling pointer use in TextEdit::resizeEvent by protecting the delayed lambda with QPointer.
• Fix Window::checkBlockShutdown to safely handle tabs with null or empty titles before checking the first character.
• Ensure Window printing tests do not delete null print document or preview pointers.
• Restrict Tabbar::eventFilter handling of ApplicationFontChange to the tab bar itself and narrow handled event types to reduce unintended side effects and logging noise.
• Update tests to use Qt6-compatible QMouseEvent, QHoverEvent, and QDropEvent constructors and remove a dangerous QString::size stub in encoding detection tests by feeding real XML data.

Enhancements:

• Extend test coverage for TextEdit multi-text comment operations and mid-button insert behavior via new stubs and safer undo signal handling.

Build:

• Enable building and running tests in both Debug and Release CMake build types.

Documentation:

• Update SPDX copyright years across several test files to include 2026.

Tests:

• Adjust multiple editor, widget, tab bar, and utility tests for Qt6 event API changes and safer test data setup, improving stability under sanitizers.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: pengfeixx

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Details

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• debian/deepin/OWNERS

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[sourcery-ai]

Reviewer's Guide

Adds safer undo/redo handling and Qt6-compatible test code to eliminate ASAN heap-buffer-overflow and null/dangling pointer risks in TextEdit, Tabbar, Window, and related unit tests.

Sequence diagram for safer TextEdit undo/redo modify-status updates

sequenceDiagram
    participant UndoStack
    participant TextEdit
    participant EditWrapper
    participant Window

    UndoStack->>TextEdit: canUndoChanged(bool)
    TextEdit->>TextEdit: slotCanUndoChanged(bool)
    TextEdit->>TextEdit: [check m_wrapper != nullptr]
    TextEdit->>EditWrapper: isTemFile()
    TextEdit->>UndoStack: canUndo()
    TextEdit->>UndoStack: index()
    TextEdit->>TextEdit: compute isModified
    TextEdit->>EditWrapper: window()
    TextEdit->>TextEdit: [cast to Window succeeds]
    TextEdit->>Window: updateModifyStatus(m_sFilePath, isModified)
    TextEdit->>EditWrapper: OnUpdateHighlighter()

    UndoStack->>TextEdit: canRedoChanged(bool)
    TextEdit->>TextEdit: slotCanRedoChanged(bool)
    TextEdit->>TextEdit: [check m_wrapper != nullptr]
    TextEdit->>EditWrapper: isTemFile()
    TextEdit->>UndoStack: canUndo()
    TextEdit->>UndoStack: index()
    TextEdit->>TextEdit: compute isModified
    TextEdit->>EditWrapper: window()
    TextEdit->>TextEdit: [cast to Window succeeds]
    TextEdit->>Window: updateModifyStatus(m_sFilePath, isModified)
    TextEdit->>EditWrapper: OnUpdateHighlighter()

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File-Level Changes

Change	Details	Files
Stub out TextEdit multi-insert/delete and undo-related slots in tests to avoid accessing non-existent Window parents and to stabilize text edit unit tests.	Introduce no-op stubs for insertMultiTextEx, deleteMultiTextEx, and slotCanUndoChanged in ut_textedit tests. Wire new stubs into setComment/removeComment and mid-button insert tests via Stub::set calls to intercept TextEdit methods. Update test copyright headers and ensure EditWrapper-based tests no longer dereference missing Window instances.	tests/src/editor/ut_textedit.cpp
Update tests for Qt6 event API changes and safer behavior around events, printing and drops.	Adjust QMouseEvent, QHoverEvent, QContextMenuEvent, and QDropEvent constructors in editor, widgets, controls, and window tests to include global positions and new parameters required by Qt6. Guard Window print-preview cleanup in tests with null checks before deleteLater. Modernize encoding detection tests by replacing risky QString::size stubs with concrete XML payloads per script. Enable building tests in both Debug and Release configurations via CMake change.	tests/src/editor/ut_textedit.cpp tests/src/common/ut_utils.cpp tests/src/widgets/ut_colorselectwidget.cpp tests/src/widgets/ut_window.cpp tests/src/controls/ut_tabbar.cpp CMakeLists.txt
Harden TextEdit undo/redo signal handling and resize behavior against null and dangling pointers.	Add null checks for m_wrapper before using it in textChanged connection and undo/redo slots. Use dynamic_cast<Window*> when accessing m_wrapper->window() and only call updateModifyStatus when the cast succeeds. Protect the resizeEvent QTimer lambda with QPointer and route documentSizeChanged and scroll updates via the guarded pointer.	src/editor/dtextedit.cpp
Narrow Tabbar event filtering to relevant objects and events and fix potential out-of-range access in Window::checkBlockShutdown.	Change Tabbar::eventFilter signature to use the watched QObject and restrict ApplicationFontChange handling to the Tabbar instance itself. Early-return from Tabbar::eventFilter for non-mouse/non-drag events and remove an extra debug log line. Cache tab text in Window::checkBlockShutdown, treat null or empty text as non-blocking, and avoid direct at(0) on possibly empty strings.	src/controls/tabbar.cpp src/widgets/window.cpp

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