[shohi]

Changes

• Keep the end of a multiline prompt visible while assistant output streams in, without moving the cursor.
• Leave the view alone when the user is reading earlier chat content.
• Add tests for the scroll and no-scroll cases.

[ericdallo]

@shohi can you explain how can I repro the issue you were having?

[shohi]

@ericdallo The issue is that a multiline prompt can become partly hidden behind the mode line. There are two ways to reproduce it on the version before this PR:

While typing

• Open a chat with enough history that the prompt is near the bottom.
• Type text and press Shift+Return several times, or paste a long line that wraps.
• The last prompt line can become partly hidden behind the mode line.

While streaming

• Ask ECA for a long response.
• While it streams, type a multiline prompt for your next message.
• Move the cursor to the first prompt line, keeping the prompt near the bottom of the window.
• Let output continue arriving. Prompt lines below the cursor can disappear below the window.

In both cases, I expect the window to scroll enough to keep the prompt end fully visible without moving the cursor. That is what this PR fixes.

[ericdallo]

@shohi I still can't repro that

Any chance this is related with your config or your modeline?

[shohi]

@ericdallo Thanks for trying it. You were right about the config: the typing case came from my pixel-scroll-precision-mode, so I removed that part and narrowed the PR to the streaming case.

Demo recorded with emacs -Q (no user config). The server API is stubbed and 10 lines are fed through eca-chat--stream-buffered-text / eca-chat--stream-flush, the same path real assistant text takes. I also reproduced it with real agent output. Point is on the first line of a 3-line prompt.

Here is a demo before and after the fix:

[ericdallo]

thanks this looks good