It augments the entry widget with a pick-list and its calling-button. This pick-list is the famous Hugelist which allows to choose among more than 1,000,000 items without time or memory penalty.
The search is based on the [string match] patterns.
doc & download: https://wiki.tcl-lang.org/_repo/ulis/Hugecombo.zip
LV The original author of this software (ulis) has died. Is anyone a significant enough user of the software to be willing to take on managing the documentation and source - or at least making the last version available?