Add test case to ensure the layer source image is updated and not removed and recreated.
Add test case to ensure the layer source image is updated
and not removed and recreated.

plotly/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js