Enable View Location customizations Part 3

[sbatten]

As a continuation of #89729

To Dos:

• Improve the drag and drop feedback for views, including within and across composites Drag and Drop for Global Awareness #92299
• Allow for multiple views within a single panel to bring things inline with the Sidebar Multiple Views Per Panel V0 #92294 Allow to show multiple panels at the same time (split pane) #11889
• Allow built-in panels to move to the Sidebar Optionally allow Problems, Debug Console, Terminal, or Output to be shown as Sidebar Icons #92052
• Investigate handling of special case viewlets like SCM

[sbatten]

work for this milestone complete.

[saluto]

Thanks for the great work.
Maybe you are already aware of the following. As a continuation I highly suggest a more generalized layout system, similar to the one of Theia (which itself uses concepts/extensions from VSCode). There seems to be no distinction between sidebar layout, panel layout and tab layout. Everything uses the same tab/grid layout system. This enables much more flexible and practical layouts.
Is this something you consider? And how difficult is it to implement?