A streaming Thinking block grew without a height cap and only moved into
the capped, scrollable box once it finished, so a long thought pushed the
whole timeline down while it streamed. The cap was dropped in June because
the box then pinned to its own end on every tick and captured the wheel,
so the chat could not be scrolled while thinking streamed.
The box is capped in every state now and follows its own end only while
streaming and only until the reader wheels or drags upward inside it;
returning to its end re-arms the follow. It is marked as a nested scroller,
so an upward wheel scrolls the box first and reaches the chat once the box
sits at its top. Growth is observed on the content box because markdown
commits asynchronously.
Testing: reasoning block tests extended for the capped, nested box while
streaming; ui type-check and lint; web build. Live reasoning stream not
exercised in a browser.
Bohdan Triapitsyn
ec089b34e8