The sidebar should "remember" which panel is open

[afercia]

When working on the sidebar and switching from the Document inspector to the Block inspector, the expanded/collapsed state of the sidebar panels is not stored and always gets reset to its initial state.

This is particularly annoying when intensively working on the sidebar. Just a quick example, see the screenshot below:

• I've closed the "Status & Visibility" panel because I want to comfortably work inspecting the Table of Contents (screenshot left)
• I want to change a header in h5 or h6 and to do so I have to switch to the Block inspector (screenshot center)
• I do my edit
• when I switch back to the Document inspector, the Table of Content panel is now closed and it's back to its initial state, with "Status & Visibility" open (screenshot right)

[youknowriad]

duplicate of #450 ?

[afercia]

More or less... will close and add a comment on #450

[afercia]

Hm no sorry, #450 is about persistence across page reloads. This is a different issue: persistence across re-renderings.

[youknowriad]

fixed by #2533