Problem or limitation
Sticky items (just merged, #13998) allow fixing the root headers to the top: The first X items stay in view, providing context. If the tree is deeper than X, direct parents are scrolled past.
In many contexts, the bottommost (direct parent) headers are important, often more so than root items.
When trying to configure deeply enough to see them, vertical space suffers because half of it is taken by headers out of view (e.g. skeleton trees):

(image credit:
@passivestar)
Proposed improvement
Add a separate bottom sticky count. Instead of the topmost items, stick the bottommost ones:
When both a top count and a bottom count are configured, and there are headers in between, add a separator:
Proposal review
Problem or limitation
Sticky items (just merged, #13998) allow fixing the root headers to the top: The first X items stay in view, providing context. If the tree is deeper than X, direct parents are scrolled past.
In many contexts, the bottommost (direct parent) headers are important, often more so than root items.
When trying to configure deeply enough to see them, vertical space suffers because half of it is taken by headers out of view (e.g. skeleton trees):
Proposed improvement
Add a separate
bottomsticky count. Instead of the topmost items, stick the bottommost ones:When both a top count and a bottom count are configured, and there are headers in between, add a separator:
Proposal review