Prevent constant size changes in native MSW wxProgressDialog

MSW implementation of wxProgressDialog adjusted the dialog size to the
size of the message shown in it on each update, resulting in visually
unpleasant constant jumping around (this is the same problem that we
used to have in wxGenericProgressDialog long time ago, see #10624).

Minimize this by using TDM_UPDATE_ELEMENT_TEXT instead of
TDM_SET_ELEMENT_TEXT for changing the element text. This still increases
the dialog size if the new element text is longer than the old value,
but at least doesn't shrink it back if it is shorter, which is already
quite an improvement.

Notice that this change requires using TDF_EXPAND_FOOTER_AREA style, as
otherwise the expanded information can't be updated without a re-layout.
But this doesn't seem to be a big loss and it's not really clear why did
we explicitly clear this flag before anyhow.

Update the dialogs sample to make it easy to test for this behaviour and
the documentation to mention MSW version peculiarities.

interface/wx/progdlg.h

@@ -194,7 +194,9 @@ public:
 
         Notice that you may want to call Fit() to change the dialog size to
         conform to the length of the new message if desired. The dialog does
-        not do this automatically.
+        not do this automatically, except for the native MSW implementation
+        which does increase the dialog size if necessary (but still doesn't
+        shrink it back even if the text becomes shorter).
 
         @param value
             The new value of the progress meter. It should be less than or equal to