user: make A->W WM_GETTEXTLENGTH use WM_GETTEXT

[Frank Richter]

Not sure how "good" this is, but it seems to work so far.

Frank Richter <frank.richter at gmail.com>
When doing A->W WM_GETTEXTLENGTH, use WM_GETTEXT behind the scenes to
obtain an exact length. This seems to match the behaviour of recent
Windowses and as well fixes a couple of regressions (caused by theming
suddenly making the standard controls Unicode).


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