Display outline indicator

[provokateurin]

Is your feature request related to a problem? Please describe.
In a long document with many sections you quickly loose the position where in the outline you are.

Describe the solution you'd like
The outline should have an indicator that shows in which section the cursor currently is.
My preferred implementation would make the current heading the accent color, just like it happens when you hover over the section to jump to it.

Describe alternatives you've considered
The indicator could also be the text in bold, but that mixes with the current outline system which already has the top level headings in bold.
A different option could be an arrow icon next to the active section.

[sebalis]

This would be a significant improvement. The wordprocessing component in OnlyOffice has it too.