fix(ui2): show messages in dialog window when entering expanded cmdline #38465

Problem:  - With expanded messages exceeding cfg.msg.cmd.height, entering
            the cmdline scrolls to the bottom and expands to the full "cmd"
            buffer text height.

          - Cursor in the pager is not always at the last message and at
            the bottom of the window when appending to the pager.

          - unreliable test: messages2_spec: "closed msg window timer removes
            empty lines".
Solution: - Achieve separation of the cmdline and message text by moving
            messages to the dialog window when entering the cmdline below
            expanded messages.

          - Set cursor to start of the first message only when first
            entering the pager. Use `norm! zb` to position last message
            at the bottom of the window (which shouldn't crash anymore
            since 911337eb).

          - Increase cfg.msg.msg.timeout used in the test file.

0 files changed, 0 insertions, 0 deletions