[bukuserver] Load a specific set of tags upon autocomplete

[GreenLunar]

I've too many tags for autocomplete (as it is now) to be working properly, even on high end machines.

Buku seems to be loading ALL tags.

I suggest to start scan only on first charter;
Once a character is pressed, load only a certain set of tags that is closest to the given characters;
Doing it otherwise causes to an excessive usage of RAM.

[GreenLunar]

Testing once again (I hope it's the right repository I'm testing).
Buku loads tags that contain a given string, not those that begin with a given string.
I suggest to load a selection that begins with a given string, so performance will be better.

e: anyway, performance is better now.

e2: buku loads a big set of tags before input of a character. (see e3, below)

e3: buku loads ALL tags just upon clicking on the tags field.

[rachmadaniHaryono]

@jarun, can we reopen this because half of this is not yet fixed by #546?

[jarun]

Sure thing!

[jarun]

@rachmadaniHaryono please confirm if this is fixed.

[rachmadaniHaryono]

no, it not yet fixed. i will look into it this weekend

current proposed solution is to add cache feature for buku tag when bukuserver start