[WIP] Optimize package search

[alexkuz]

• call installer.get_description() with for_search=True for faster search (I'm not 100% sure what's the difference in terms of searching but it seems appropriate and the performance gain is very noticeable*)
• cache name, summary, description etc. for each package for faster consequent searches
• pre-generate search cache in background when installer is ready
• reset page to landing if search input is empty
• cancel current search if user navigated back to landing
• minor performance improvements (iterate through packages without redundant allocations)

UPD:

• improve search performance more with CooperativeIterator
• show progress bar on package search instead of spinner

Before	After
simplescreenrecorder-2025-06-01_13.42.01.mp4	simplescreenrecorder-2025-06-01_13.27.04.mp4

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*) 12s vs 200s on my machine

[mtwebster]

Hi, the performance of even the initial search is a nice improvement but have you had a look at how the mintcommon installer library?

The PkgInfo objects are already part of a cache... once you fetch the description (installer.get_description()) it's already added to that in-memory cache. I wonder if some of what you're doing here could be simplified to make use of this, instead of building an entirely new cache here.

I'd also rather add to the mintcommon classes instead of tacking on search_cache, etc...

[mtwebster]

I had to really concentrate before this made sense.. can you make it something like:

description=None if not search_in_description
    else self.installer.get_description(pkginfo, for_search=True).upper()

[alexkuz]

@mtwebster thank you for the review! I forgot all the details tbh, but your comments make sense to me. Maybe with the later additions search cache is not that useful, I'll need to take another look.

(I didn't want to touch mintcommon/installer originally, partly because I don't know if it used anywhere else and if it's a good idea to add code only relevant to mintinstall there)