Fix the size of the font returned from wxTextCtrl::GetStyle() in wxMSW.

Due to a typo the size was expressed in 1/10th of a point and not in points.
Fix this and add a unit test checking that GetStyle() returns the same font as
was set by SetStyle().

Closes #2120.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70341 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/textctrl.cpp

@@ -2744,7 +2744,7 @@ bool wxTextCtrl::GetStyle(long position, wxTextAttr& style)
     // Convert the height from the units of 1/20th of the point in which
     // CHARFORMAT stores it to pixel-based units used by LOGFONT.
     const wxCoord ppi = wxClientDC(this).GetPPI().y;
-    lf.lfHeight = -MulDiv(cf.yHeight/2, ppi, 72);
+    lf.lfHeight = -MulDiv(cf.yHeight/20, ppi, 72);
     lf.lfWidth = 0;
     lf.lfCharSet = ANSI_CHARSET; // FIXME: how to get correct charset?
     lf.lfClipPrecision = 0;