Can't override the svgCusor

[flyhuang]

Prerequisites

• [Y] Which version are you using? (Is it latest?)
• [Y] Are you reporting to the correct repository?
• [Y] Did you search existing issues? (Were any related?)

Description

Can't override the svgCusor of tool.

Steps to Reproduce the issue

1. Set showSVGCursors to "true"

cornerstoneTools.init({
  showSVGCursors: true
});

2. create a custom svg cursor:

var MouseCursor = cornerstoneTools.importInternal("tools/cursors/MouseCursor");

var _wwwcCursor = new MouseCursor(
  '<path fill="#FFFFFF" d="M200,0C89.1,0,0,89.1,0,200c0,110.9,89.1,200,200,200c110.9,0,200-89.1,200-200C400,89.1,310.9,0,200,0L200,0z M200,381.8V18.2c100,0,181.8,81.8,181.8,181.8S300,381.8,200,381.8L200,381.8z"/>',
  { viewBox: { x: 400, y: 400 } }
);

2. override old svg cursor:

cornerstoneTools.addTool(cornerstoneTools.WwwcTool, { svgCursor: _wwwcCursor });

Expected behavior: (What you expected to happen) Show new svg cursor when active wwwc tool.

Actual behavior: (What actually happened) Throw error: svgCursor.getIconWithPointerSVG is not a function

CodeSandbox With Reproduction of Issue:

• issue Example

[flyhuang]

it looks like utils deepmerge func miss clone proto func.

[KaiOtto]

Has this issue been fixed? The new cornerstone does not support the code from the sandbox at all. I am now stuck with the questions:

1. How to override the cursor for an existing tool?
2. How to set the cursor for a new custom tool?