Module changeset 

Text editing changeset system (FUTURE ARCHITECTURE - NOT YET IMPLEMENTED)

STATUS: This module defines the planned architecture for a unified text editing changeset system, but is not yet implemented. Current text editing works through:

• text3::edit module for text manipulation
• managers::text_input for event recording
• window.rs for integration

This module serves as a design document for post-1.0 refactoring.

Planned Architecture (Future)

This module will implement a two-phase changeset system for all text editing operations:

1. Create changesets (pre-callback): Analyze what would change, don’t mutate yet
2. Apply changesets (post-callback): Actually mutate state if !preventDefault

This pattern will enable:

• preventDefault support for ALL operations (not just text input)
• Undo/redo stack (record changesets before applying)
• Validation (check bounds, permissions before mutation)
• Inspection (user callbacks can see planned changes)

Structs

TextChangeset

A text editing changeset that can be inspected before application

TextOpClearSelection

Clear all selections

TextOpCopy

Copy selection to clipboard (no text change)

TextOpCut

Cut selection to clipboard (deletes text)

TextOpDeleteText

Delete text in range

TextOpExtendSelection

Extend selection in a direction

TextOpInsertText

Insert text at cursor position

TextOpMoveCursor

Move cursor to new position

TextOpPaste

Paste from clipboard (inserts text)

TextOpReplaceText

Replace text in range with new text

TextOpSelectAll

Select all text in node

TextOpSetSelection

Set selection to new range

Enums

CursorMovement

Type of cursor movement

SelectionDirection

Direction of selection extension

TextOperation

Text editing operation (what will change)

Functions

create_copy_changeset

Creates a copy changeset from the current selection.

create_cut_changeset

Creates a cut changeset from the current selection.

create_delete_selection_changeset

Creates a delete changeset for the current selection or single character.

create_paste_changeset

Creates a paste changeset at the current cursor position.

create_select_all_changeset

Creates a select-all changeset for the target node.set for the target node.

Type Aliases

ChangesetId

Unique identifier for a changeset (for undo/redo)