Subject: bug#78815: 31.0.50; completions truncated

From: Colin Baxter <[email-masked]>
Date: Wed, 25 Jun 2025 17:59:11 +0100

>>>>> Bug reports for GNU Emacs, the Swiss army knife of text editors <Michael> writes:

    > Colin Baxter <[email-masked]> writes:
    >>>> This part has not been clear to me so far: you scroll the
    >>>> completions buffer with the mouse.

    >> That is strictly correct, but I need to clarify it.
    >> 
    >> 1. If I use the mouse to put the cursor in the completion buffer,
    >> I can then use either C-v or the down arrow to move down the
    >> buffer. In both cases, I see the button.
    >> 
    >> 2. The only route I have found in order not to see the button is
    >> to use multiple <TAB>.

    > Thanks.

    > AFAIU, this is expected given the current design.  Do we want to
    > fix this?

    > My personal opinion is that we could indeed improve the user
    > experience here, since scrolling the completions using the
    > ordinary scroll commands is something that people just will try.
    > Could this be improved so that the result would work reliably?

I have no strong option. Perhaps it would be enough to suggest that
using tabs in future would eliminate the button?

Colin.