ProtocolGSUndoClientProtocolDeclarationprotocol GSUndoClientProtocolDeclaration@protocol GSUndoClientProtocolDeclarationGSUndoClientProtocolTopicsInstance PropertiesisEditableeditableeditableisLockedlockedlockedjustLockedlastChangelastOperationIntervalInstance Methodsdocument()documentdocumentstartUpdates()startUpdatesstartUpdatesstopUpdates()stopUpdatesstopUpdatesupdateChangeCount(_:)updateChangeCount:updateChangeCount_RelationshipsConforming TypesGSGlyph