Add/Remove image on GOJS diagram with undo-redo functionality

[walter]

I really cannot read your code. Please format and properly indent your code by surrounding each section with lines consisting of triple backquotes.

Code Formatting

This forum supports Github Flavored Markdown Standard Markdown converts text with four spaces at the beginning of each line into a code block; GFM also supports fenced blocks. Just wrap your code in ``` (as shown below) and you won’t need to indent it by four spaces. For example: ```js console.log('hello world'); ``` will output: console.log('hello world'); Other choices for language include C#, Visual Basic, JSON and XML.

Instead of removing and then re-adding a node, why not modify it by calling Model.setDataProperty?