🐞 Programmatic cursor state updates are never applied

從 SourceEditor.updateControllerWithState(_:controller:) 開始，檢查 state.cursorPositions 如何與 controller 目前的游標位置進行比較。重現 issue 中描述的 binding 更新，然後驗證為 SourceEditorState.cursorPositions 指派不同的值會移動底層 TextViewController 的游標。

Description

Programmatic updates to SourceEditorState.cursorPositions are never applied to the underlying TextViewController.

In SourceEditor.updateControllerWithState(_:controller:), the new cursor positions are compared with the same state value:

if let cursorPositions = state.cursorPositions, cursorPositions != state.cursorPositions {
    controller.setCursorPositions(cursorPositions)
}

Because cursorPositions was just unwrapped from state.cursorPositions, the comparison is always false.

To Reproduce

1. Create a SourceEditor with a binding to SourceEditorState.
2. After the editor appears, programmatically assign a different value to state.cursorPositions.
3. Observe that the editor cursor does not move to the requested position.

Expected Behavior

Changing SourceEditorState.cursorPositions should update the cursor positions in the underlying controller.

The comparison likely needs to use the controller's current state:

if let cursorPositions = state.cursorPositions,
   cursorPositions != controller.cursorPositions {
    controller.setCursorPositions(cursorPositions)
}

Version Information

CodeEditSourceEditor: main, revision 1fa4d3c
macOS: 15.7.9
Xcode: 26.3 (17C529)

Additional Context

No matching open or closed issue was found before filing this report.

Screenshots

Not applicable.