[Annoyance] resizing of echo area is too eager

["Wedler, Christoph" <christoph.wedler@sap.com>]

[Test using Emacs-21.2.95.1.]

Sometimes, the echo area is unnecessarily resized, e.g. reserves too
many lines:

 1. Select input method `korean-symbol':
       C-u C-\ korean-symbol RET

 2. In the buffer, enter the 4 characters
       f r a c

  => Emacs reserves 2 lines for the echo area, while only one is
  necessary


My guess is that this is due to var-width fonts -- if I define a input
method producing ASCII chars, this annoyance does not happen:

    (quail-define-package "test" "test" "test" t)
    (quail-define-rules ("ab" "abc"))

 1. Select input method `test':
       C-u C-\ test RET

 2. In the buffer, enter the 2 characters
       a b

  => Emacs correctly only reserves 1 lines for the echo area

- Christoph