How can i add minimap for graph?

[MaksZhukov]

Is your feature request related to a problem? Please describe.
I want to add minimap for my graph and see canvas objects if they are outside the canvas after zooming
I use this functionality and put the result inside src for image, but it provides only zoomed object. It doesn't includes objects outside zoom
canvas.toBlob( (blob) => { onUpdateDataURL(blob) }, 'image/webp', 0.7 );
How can I solve it?

Describe the solution you'd like
Minimap

[vasturiano]

Duplicate of #490