bug: Fix search result cycling when using different search term

[ngshiheng]

Hi there! thanks for making this great tool!

Bug

I found a subtle bug in the search functionality. Basically when I hit the "Enter" key with the search term "first_dep" and then change my search term to "second_dep", hitting the "Enter" key again would still cycle me through the results of "first_dep"

NOTE: this doesn't happen if i were to manually click the search icon

Fix

The fix i made was pretty straightforward -- i added a lastSearch term to track changes in the search input
The code now correctly handles transitions between different search terms when hitting "Enter" key

[bayraktugrul]

Hi @ngshiheng, nice catch! The changes definitely improved it. Thank you for your contribution.