Resend without test depending on JScript.

Before the end of the text was selected when clicking below the end of
the text, rather than using the x position to find the appropriate
character on the last row that is closest to the pixel position.

RenderFile should add a source filter and call Render on each output
pin, while Render() should try to connect, first directly to any
existing renderers, and then using intermediates. It uses recursion
since this is the only possible way to implement Render sanely.