updateRenderItem method
DecorationItemの更新
Implementation
void updateRenderItem(RenderItem<DecorationItem> renderItem) {
state = state.copyWith(
historyRenderItems: [
state.renderItems
.map(
(item) => item.uuid == renderItem.uuid ? renderItem : item,
)
.toList(),
...state.historyRenderItems,
],
currentHistoryIndex: 0,
);
_paletteState.changeEditingText(false);
}