Sketch plugin: Save error with arrow object

[linusfj]

Describe the bug
An error occurs when attempting to save a workspace in the Sketch plugin after adding an arrow object. The specific error message displayed is: "Error while adding feature: TypeError: i.getZIndex is not a function."

To Reproduce
Steps to reproduce the behavior:

1. Open the Sketch plugin.
2. Add an object of the type "Arrow".
3. Open the Save view.
4. Attempt to save the workspace.
5. Note the error message: "Error while adding feature: TypeError: i.getZIndex is not a function."

Expected behavior
The workspace, including the arrow object, should save without any errors.

[Hallbergs]

Looks like its introduced in ef71ff7 @jesade-vbg could you have a look?

[jesade-vbg]

There are actually more bugs related to Arrow. This below happens when you're in edit mode and click on an arrow.

Failed to set arrow style. Error: TypeError: Cannot read properties of undefined (reading 'getStroke')

[Hallbergs]

Do you want me to take a look at it or will you?

[jesade-vbg]

Looking into it a bit. Noticed another bug. Cant move arrow.