!2835 优化: 重命名图层时不能拖拽，修改菜单图标

src/UI/Components/ToolBar/Layer/LayerManager.tsx

@@ -152,7 +152,7 @@ export class LayerManager extends React.Component<{}, {}>
                     }}
                 />
                 <MenuItem
-                    icon="multi-select"
+                    icon="inheritance"
                     text="将选中实体置为该图层"
                     onClick={() =>
                     {
@@ -201,7 +201,7 @@ export class LayerManager extends React.Component<{}, {}>
                 data.visible && this._LineRefs.push(lineRef);
                 return (<>
                     {data.visible &&
-                        <div ref={lineRef} data-key={data.name} draggable="true"
+                        <div ref={lineRef} data-key={data.name} draggable={!data.changeable}
                             onDrag={e =>
                             {
                                 e.preventDefault();