These popovers are horrible. They don’t fit in the interface, hide part of the 3D View, necessitate extra clicks and are undiscoverable.
On a related note:
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Positions of cursor and vertices could easily live in the bottom bar, instead of the shortcuts help that doesn’t even follow custom changes made to the keymap.
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Addons should be able to create pie menus, floating windows and custom editors, so people can just subdivide a part of their UI and add the custom window in it. It’s much more powerful than adding buttons to a slide out side bar.
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UV and Node parameters should absolutely live in the property panel. There’s tabs just for that already.
I know you like your solution Alberto and you’ve dedicated a lot of work to it, but at the moment there’s too many problems with it. The top bar you propose has too many different types of settings in it, it’s not a metaphore for anything. It’s just the top bar of the 3D view and the top bar of blender merged into one. The top bar of the 3D view is there for a reason, it only affect the 3D view. Merging it to a different UI element makes no sense in terms of design, only aesthetics. I would argue the tools settings top bar we have at the moment makes more sense than it, and I think it has many problems.
I do like the physical search bar though, I think that should definitely exist.
The only thing that makes sense for a top bar in blender is to remove some of those menus and expose functions as easily accessible buttons, the way MS Word, OSX Finder, and virtually every other software in the world does.