user: make A->W WM_GETTEXTLENGTH use WM_GETTEXT [try 2]

[Frank Richter]

Don't call window proc directly, dispatch WM_GETTEXT with SendMessageW().

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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