about QM3 Some suggestions

[Davider]

Suggestions:

• Allow custom panel layouts to be saved with a name.
  
• Support saving multiple layouts.
  
• Allow switching between layouts by layout name.
  
• Provide an option to restore the default LA layout.
  

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Toolbar height: it is made maximally flexible. Eg a stack can contain child panels and toolbars.

If it is too flexible, it can be confusing for users.
It is recommended to keep panels flexible, while applying appropriate constraints to the toolbar and menu bar.