Add a Low Priority room filter behind a feature flag.

[Copilot]

This PR implements a new "Low Priority" room filter (hidden behind a feature flag), with the key requirement that low priority rooms are hidden by default in the room list (when the flag is enabled).

Core Filter Implementation

• Added lowPriority case to the RoomListFilter enum
• Configured incompatibility rules: Low Priority cannot be combined with Favourites or Invites filters

Default Hiding Behavior

The implementation handles the new SDK filter architecture where:

• Default state: NonLowPriority filter will be included to hide low priority rooms by default
• When Low Priority filter is activated: Switches to LowPriority filter to show only low priority rooms

This logic is implemented in RoomSummaryProvider.setFilter()

Simulator.Screen.Recording.-.iPhone.16.Pro.-.2025-08-13.at.10.31.16.mp4

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[pixlwave]

@copilot There's a PR in the SDK now with the required filters: matrix-org/matrix-rust-sdk#5508

I'll integrate it in a bit, but you can update this PR in preparation. Unfortunately we needed 2 new filter types LowPriority and NonLowPriority. What we're going to need is to have the latter always part of the filters whenever your new RoomListFilter.lowPriority isn't set, and when it is, we switch it out for the former.

[Copilot]

@copilot There's a PR in the SDK now with the required filters: matrix-org/matrix-rust-sdk#5508

I'll integrate it in a bit, but you can update this PR in preparation. Unfort...

I've updated the implementation to prepare for the new LowPriority and NonLowPriority filters from SDK PR #5508. The logic now:

• Uses NonLowPriority filter by default (to hide low priority rooms)
• Switches to LowPriority filter when the Low Priority filter is activated
• Has clear TODO comments showing exactly where the SDK integration will happen

Ready for when you integrate the SDK update! (commit ea1f6b3)

[stefanceriu]

This comment feels unnecessary, perhaps we should name the app side filter better e.g. onlyLowPriority

[pixlwave]

Lol oh yeah that one is very random, removing it.

I get what you're saying about the name, but technically they're all only, e.g. onlyFavourites, onlyRooms etc so I'm not sure how much that would help. I think it's clear from the comment on .lowPriority's rustFilter value.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
1048	1	1047	0

View the full list of 1 ❄️ flaky tests

DeferredFulfillmentTests::testObservableMultipleUpdates()

Flake rate in main: 18.75% (Passed 143 times, Failed 33 times)

Stack Traces | 12.2s run time

Asynchronous wait failed: Exceeded timeout of 10 seconds, with unfulfilled expectations: "Awaiting stream". (.../Other/Extensions/XCTestCase.swift:76)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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