🐞 Programmatic cursor state updates are never applied

从 SourceEditor.updateControllerWithState(_:controller:) 开始，检查 state.cursorPositions 如何与 controller 当前的光标位置进行比较。重现 issue 中描述的 binding 更新，然后验证为 SourceEditorState.cursorPositions 赋予不同的值会移动底层 TextViewController 的光标。

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.