Wait for preferences before showing suggested feeds

[haileyok]

Why

The useSavedFeeds query needs the user's preferences to be loaded first. Generally a user's preferences should be loaded already and cached before we enter the wizard, but its possible for them to be invalidated when we enter. If they are invalidated, they will get refetched inside of useSavedFeeds.

While fetching preferences, the useQuery in useSavedFeeds is disabled. This means that isLoading will be false for a moment - so just checking isLoadingSavedFeeds will not always work. Instead, we want to look at isFetchedAfterMount.

Test Plan

You can add a test promise as shown in the video below and remove staleTime: Infinity.

Before

Screen.Recording.2024-06-24.at.2.16.33.PM.mov

After

Screen.Recording.2024-06-24.at.2.17.24.PM.mov

[render]

Your Render PR Server URL is https://social-app-pr-4618.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cpsuct88fa8c73d124r0.

[github-actions]

Old size	New size	Diff
6.47 MB	6.47 MB	27 B (0.00%)

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[gaearon]

since saved feeds are always earlier in concatenation, is there any downside to making just the concat conditional?

[haileyok]

Yea that seems fine. Probably a good likelihood these will already be loaded so seems nice to have something show up immediately.