Show elapsed/estimated times in wxMSW wxProgressDialog by default

This further improves the dialog usability when the main thread doesn't
update it frequently enough, as these times can be seen immediately
without having to expand the "details" part of the dialog which can be
very sluggish in this case.

It is also more consistent with the generic dialog and the behaviour of
the native dialog before 6b91c5dfab876f0f1b17d54304bfb2fda27398ef which
removed the code clearing TDF_EXPAND_FOOTER_AREA style.

src/msw/progdlg.cpp

@@ -987,10 +987,12 @@ void wxProgressDialog::UpdateExpandedInformation(int value)
     unsigned long remainingTime;
     UpdateTimeEstimates(value, elapsedTime, estimatedTime, remainingTime);
 
-    if ( m_sharedData->m_progressBarMarquee )
+    // The value of 0 is special, we can't estimate anything before we have at
+    // least one update, so leave the times dependent on it indeterminate.
+    //
+    // Similarly, in indeterminate mode we don't have any estimations neither.
+    if ( !value || m_sharedData->m_progressBarMarquee )
     {
-        // In indeterminate mode we don't have any estimation neither for the
-        // remaining nor for estimated time.
         estimatedTime =
         remainingTime = static_cast<unsigned long>(-1);
     }
@@ -1081,6 +1083,13 @@ void* wxProgressDialogTaskRunner::Entry()
         {
             tdc.pszExpandedInformation =
                 m_sharedData.m_expandedInformation.t_str();
+
+            // If we have elapsed/estimated/... times to show, show them from
+            // the beginning for consistency with the generic version and also
+            // because showing them later may be very sluggish if the main
+            // thread doesn't update the dialog sufficiently frequently, while
+            // hiding them still works reasonably well.
+            tdc.dwFlags |= TDF_EXPANDED_BY_DEFAULT;
         }
     }