Coloured active tab in Developer

When several tabs are open in KMDeveloper it is not always obvious which one is active. Distractions can lead to one making mistakes. Is something similar to this possible?
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Red for unsaved tabs, green for the active one could be one answer.

It’s possible, but not trivial with the current components we use for tabbed controls. See https://github.com/keymanapp/keyman/issues/845 for similar requests.