auto complete control - select last value

[gdb]

For example: There is a auto completion control defined for postal codes.

A user wants to insert a postalcode and goes to the next input field.
When the user enters "9000", the postalcode is complete and the user pushes the tab-key (or clicks somewhere else) to go on with the next input field. When this user pushes the tab-key the input of "9000" is disappeared beceause the user hasn't choose an option from the autocomplete-list (ac-results).

Is it possible to select the last residual option if the input and the last option is exact the same, without expliciet click on that option?

[jgou]

see also other autocomplete issues: #244, #351