fix(cmp): reduce blink-ripgrep freeze in complex directories

[ayamir]

Summary

• Increase prefix_min_len from 2 to 3, reducing how often ripgrep is triggered while typing
• Move context_size to the correct backend scope (was silently ignored under backend.ripgrep) and set it to 0 to eliminate context-line parsing overhead
• Add --max-count=5 to additional_rg_options so ripgrep exits each file after 5 matches instead of scanning the entire tree

Test plan

• Open a file inside a large/complex directory
• Enter insert mode and type 3+ characters
• Verify completion suggestions appear without freezing
• Verify ripgrep suggestions still show up in the completion menu

Fixes #1574

[ayamir]

@Cloud0310 Can you check this PR?

[Copilot]

Pull request overview

This PR adjusts the blink-ripgrep completion provider configuration to reduce UI freezes when editing within large/complex directory trees, addressing issue #1574.

Changes:

• Increase prefix_min_len from 2 → 3 to reduce how often ripgrep queries are triggered while typing.
• Move context_size to the backend scope and set it to 0 to avoid context-line parsing overhead.
• Add --max-count=5 to ripgrep options so it stops scanning each file after a small number of matches.

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[charliie-dev]

LGTM

[Cloud0310]

@Cloud0310 Can you check this PR?

Yeap, my fix is the same idea here, just 3 prefix, and max 200K file size is enough on my situation. For now, just two of those is enough for me.

[Cloud0310]

I suggest we remove the extra option for ripgrep, and just use prefix 3 and max size as 200K. I would love to test further.
Here's my config:

			ripgrep = {
				module = "blink-ripgrep",
				name = "Ripgrep",
				opts = {
					prefix_min_len = 3,
					backend = {
						use = "gitgrep-or-ripgrep",
						ripgrep = {
							context_size = 3,
							max_filesize = "200K",
						},
					},
				},
				score_offset = -15,
				max_items = 3,
			},

Here, according the docs of blink-ripgrep, I added gitgrep as backend, ref as it may have better performance with git tracked files.

[charliie-dev]

LGTM