Without this fix, the autocomplete field would try to select the CPNotFound index from time to time which has always been wrong but is now specifically an error in Cappuccino.
The fix is to select nothing instead.
Without this fix, the scroll handle in the token field autocomplete menu could not be moved using the mouse. Only scroll wheel or keyboard based scrolling was possible.
This fix enables regular mouse interaction with the scrollbar.
After recent changes clicking on an autocomplete item in the pop up did nothing. Now this works and in conjunction with the new non-key-window-change update it's likely to work better than before.
If the token field was in a window not placed in the upper left corner of the screen (like regular platform windows are), the autocomplete menu would show up in the wrong spot.
If an autocomplete choice was made followed by immediately focusing on another control, the token field would reclaim first responder status a moment later.
The new menu is much more efficient for the user:
* Less tall items makes it much easier to select among many completions.
* Exactly wide enough for widest item.
* Tall enough to show all items (instead of just 3 as before).
* Uses a maximum width and height defined by the screen edges and some Cocoa-like constants.
The menu should appear above other normal windows and controls like a regular CPMenu. To do this, put the pop up in its own window with the `CPPopUpMenuWindowLevel` window level.
Alexander Ljungberg
Aparajita Fishman
Martin Carlberg