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After an attempt at removing a Ruby platform installed from sources it is still shown in the platform manager (probably didn't remove everything necessary, but that's not the issue here) with display name "Valid platform has to selected". Probably should be "Invalid Platform" or something like that, or shouldn't be shown at all in the platform manager. I'm attaching a screenshot and the log.
Created attachment 73772 [details] screenshot
Created attachment 73773 [details] log
Thanks for the catch. Should be easy to fix, setting TM -> 7.0.