Manage undo/redo for Apple text editors using NSTextStorage and UndoManager.
npx skills add https://github.com/sitapix/apple-text --skill apple-text-undo
Please help me install this Agent Skill. Skill: apple-text-undo Source: https://github.com/sitapix/apple-text/tree/main/skills/apple-text-undo Command: npx skills add https://github.com/sitapix/apple-text --skill apple-text-undo
Undo/redo management for Apple text editors, ensuring reliable grouping, coalescing, and correct inverse edits across TextKit 1/2 and NSTextStorage.
Explain how to implement and debug undo/redo in a custom text editor using NSTextStorage and UndoManager.
High-intent search queries and answers about installing and using this skill.
To make programmatic edits undoable in NSTextStorage, route changes through textStorage using beginEditing and endEditing lifecycle methods. This ensures the UndoManager properly registers edits and changeInLength handling for reliable inverse operations.
Undo breaks in custom NSTextStorage subclasses when processEditing lifecycle or changeInLength handling is mismanaged. Proper beginEditing/endEditing grouping and UndoManager registration are required to maintain safe undo chains and prevent broken inverse edits.
Group multiple text edits into a single undo action by wrapping programmatic changes with explicit beginUndoGrouping and endUndoGrouping calls. This coalesces edits within NSTextStorage to behave as one predictable undo operation.
TextKit 2 supports UndoManager patterns but requires performEditingTransaction semantics for custom NSTextStorage. The Skill addresses both TextKit 1 and TextKit 2 patterns to ensure reliable grouping and coalescing across both versions.
Yes, wrapping programmatic edits in beginEditing and endEditing fixes broken undo chains in UITextView. These methods ensure processEditing lifecycle correctly registers changes with UndoManager and maintains proper changeInLength tracking for safe undo data.
Common pitfalls include misregistrations with UndoManager, improper changeInLength handling, and broken undo chains from incorrect beginEditing/endEditing nesting. The Skill provides guardrails to prevent these issues and ensure reliable coalescing across TextKit 1/2.
EmasoftImplement custom UITextInput and NSTextInputClient views for Apple platforms.
Yuan-ZzzzManage Unity Editor undo/redo history with built-in API.
pradeepmouliDocument TextKit 2 architecture, migration paths, and SwiftUI TextEditor integration.
AVIDS2Prevent automatic AI model invocation and require manual activation via command.
