When using multiple stacks and changing the mode from “Edit” to run and switch to another stack the other stack is still showing the “Edit” decorations. The same also happens when changing from “Run” to “Edit” mode. This is a minor problem but it is confusing and shows that the online IDE is not always in sync.
Thank you for the bug report Bernd. I have filed this as an issue and we will work on fixing it as soon as possible.