Summary

On wide viewports with sticky SideInfoPanel, when the main detail content is shorter than the side panel, the lower part of the side panel cannot be scrolled into view. There is no nested sidebar scrollbar (by design from issue #2909), and the shared page scroller has nothing left to scroll because the main content is not tall enough.

Steps to reproduce

1. Open a build detail page on a wide viewport (≥1199px) where sticky side info is active.
2. Select a tab whose main content is shorter than the side panel (e.g. Pipeline when the pipeline graph is short).
3. Observe that side panel content is cut off at the bottom (e.g. Reference and content below).
4. Try to scroll (wheel / trackpad / keyboard) to reach the cut-off side content.

Expected

All side panel content remains reachable.

Actual

The cut-off side panel content cannot be reached. Scrolling does nothing useful because the main page is not long enough to create additional scroll range, and the side pane has no inner scrollbar.

Screenshot

From issue #2994:

Annotations in the screenshot:

1. Bottom of the side panel — unable to scroll down
2. Main content area — not long enough to extend the shared scroller

Notes

• Wide / sticky mode only; narrow and .hide-side-info overlay behavior is separate.
• Reported and confirmed in issue #2994 (the linked-scroll improvement was declined; this tracks the underlying reachability bug instead).
• Reporter mentioned a second similar case; only this reproduction was attached.

Related

• issue #2994 (discussion / confirmation)
• issue #2909 (sticky SideInfoPanel without inner scrollbar)