This might fix #1095.

  When we resize the conpty buffer, we'll call into
  SCREEN_INFORMATION::_InternalSetViewportSize, which will try to keep the
  commandline visible.
  However, we don't even want the commandline visible while that's happening.
  We should hide it and reflow the start of the commandline.

  I'm actually not sure this is the fix for #1095. #1095 uses WSL, which isn't
  going to be COOKED_READing.

  Aditionally, the commandline can end up in some weird places after this. Like
  when restoring down with a commandline wider than the restored width, the
  commandline will appear one line below where it should. That might be a side
  effect of the rest of the changes I'm prototyping (for #1795)

src/host/getset.cpp

@@ -596,7 +596,10 @@ void ApiRoutines::GetLargestConsoleWindowSizeImpl(const SCREEN_INFORMATION& cont
         if (NewSize.X != context.GetViewport().Width() ||
             NewSize.Y != context.GetViewport().Height())
         {
+            CommandLine& commandLine = CommandLine::Instance();
+            commandLine.Hide(FALSE);
             context.SetViewportSize(&NewSize);
+            commandLine.Show();
 
             IConsoleWindow* const pWindow = ServiceLocator::LocateConsoleWindow();
             if (pWindow != nullptr)