The dictation overlay is absolutely positioned over the composer, so the
transcript could not expand it — long dictations clipped after two lines.
ComposerDictation now measures the transcript text block (not the flex-1
container, which would feed the composer's own height back and creep a few
px per update) and reports it to ChatInput, which feeds it into the
textarea autosize: same line cap as typing, transcript area scrolls past
it and follows the newest words. Idle/unmount releases the height, and an
idle sibling instance (mobile footer + wrapper engine) can no longer zero
the active one's report.
Bohdan Triapitsyn
856b312da1