cache for custom script mode.

[navneetankur]

For custom script mode, the history doesn't seem to be saved in .cache folder. Is this normal/expected? Why isn't cache available for custom script?

[DaveDavenport]

Because it to purpose dependent and it won't be possible to make a generic solution that works for a significant set for dmenu/script mode.

The script can implement a history mode itself that works for its use-case.