Search is not exhaustive

• I have searched open and closed issues for duplicates
• I am submitting a bug report for existing functionality that does not work as intended
• This isn't a feature request or a discussion topic

Bug description

On iOS and on the lastest version of Signal (7.54.1 (727)), searching inside a conversation is not exhaustive.

Steps to reproduce

• A long conversation (I see the issue on a long conversation of about 30k messages over the last 5 years)
• Search for a "http" or "https"

Actual result:

• If I search for "http" I get 212 results.
• If I search for "https" I get 215 results.

Expected result:
"https" should raise as many or less results as it is more specific than "http"

Actual result:
If I search for "http" the first match is a link from 2021 ("1 of 212"). The last match ("212 of 212") is indeed the first shared in this conversation.

Expected result:
Links between now and 2021 should also appear in the results.

Device info

Device: iPhone 16 Pro

iOS version: 18.3.2

Signal version: 7.54.1 (727)

Link to debug log

https://debuglogs.org/ios/7.55.0/be3e98c50e4ea5820d796379cbc05765a79b536b9f990e728148abbe28b985c8.zip

Start by reproducing the issue on iOS with a long conversation and the searches described, using the linked debug log for context. Trace the conversation-search entry point and compare the returned matches for “http” and “https”; done means links across the full conversation are included and the expected result counts are consistent.