Would absolutely love to see this behaviour! And not just for Comments and Inspector but also for Project info.
The example @theCrow has shown is very similar to other applications with multiple panels, like Illustrator, Photoshop or even Visual Studio, where there is a choice between overlapping them (with separate tabs) or separating them into panels (or a mix), usually with the ability to “collapse” panels, so only the title bar shows, or adjust how much vertical space each panel takes up.
Here’s an annotated screenshot from Illustrator:
- Multiple panels stacked in one location with tabs to navigate between them
- Collapsed panels show only the navigation tabs - double-click any tab to collapse panel, click any tab in a collapsed panel to expand it.
- Divisions between panels are adjustable, usually up to some minimum height (Blue mark represents the user’s cursor when hovering over division).
In Illustrator the user can choose whether individual panel “windows” are visible and can reorganize where panels go:
- Clicking on the panel background (to the right of the tabs) and dragging and dropping with the mouse below, above or between two panels moves the whole panel to that location.
- Doing the same but dropping with the mouse over a panel add the dropped panel(s) to the stack, with their tabs located on the right.
- Clicking on a tab and dragging and dropping with the mouse beside or between two tabs moves its location in the tab order
- Doing the same and dropping it above, below, or between another panel inserts a panel with just that tab in it at the appropriate location.
- Doing the same and dropping it on top of another panel has the same effect as doing that with a whole panel.
Panels that are turned off reappear in the same location when turned back on