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This is a re-PR of #6983, which implements the filtering feature for town name list like below:
(I reopen a PR since I have no idea how to change branch of previous PR)
Now it does not blink and seems stable unlike #6983 as @LordAro said.
Nevertheless, please let me know if there any problem with my commit and also please aware that I'm very new to both C/C++ and OpenTTD's codes.