Not always getting Button1Clicked events on Netdriver or CursesDriver

[tig]

On both NetDriver and CursesDriver:

• Run UI Catalog
• Hit Ctrl-A to show about box
• Move mouse over OK button and press button1 - nothing happens
• Don't move mouse and click OK button again - about box exits

Debugging this by adding Debug.WriteLine to ProcessMouseEvent:

If the mouse has not moved since last mouse event, we get

Button1Pressed
Button1Released
Button1Clicked

If the mouse HAS moved we get

Button1Pressed
Button1Released

This happens on both these drivers. On WIndowsDriver we get:

Button1Pressed
Button1Released
Button1Clicked

WindowsDriver has a ton of logic in it, that I don't fully understand, apparently to generated clicked events that neither NetDriver or Curses has.