I wonder why developers have so much opposition to way how was the tab stacks done with old Presto core. What is the poin just do it differently and make lots of issues in process? Just make it same and wrap it around new GUI design. Why do you have to invent the wheel again?
All these issues will be gone simple by make it like (or at least similar) as old Presto:
Just look how great it was... just imagine whole thing with new graphic design of course:
https://www.youtube.com/watch?v=eaaYp8544bs