When using `dotnetup sdk uninstall` to uninstall the daily SDK, the preview SDK is removed instead of the daily SDK.

[EmilyFeng97]

INSTALL STEPS

1. Clean machine: Win11 x64 25h2 ENU
2. Install dotnetup tool: iwr https://aka.ms/dotnetup/get-dotnetup.ps1 | iex

Repro Steps

1. Add dotnetup to the PATH in Current session.
2. Install the latest preview release (11.0.100-preview.5) and daily build(11.0.100-preview.6) using following step:
   dotnetup sdk install preview daily
3. Then uninstall the daily SDK build
   dotnetup sdk uninstall daily
4. Run dotnetup list to check the installed SDK

Note:

1. This issue does not repro if I uninstall the preview build first.

Actual Result
If I uninstall the daily sdk build first, the 11.0.100-preview.5 SDK is removed, not the 11.0.100-preview.6 SDK.

[dsplaisted]

This is because UpdateChannel.Matches runs offline and doesn't know that preview.6 isn't yet in the preview channel. So it thinks preview.6 satisfies both the daily and preview channels, and garbage collects the preview.5 version.

To fix this, we probably need to cache the latest version available in a channel and consult that when garbage collecting. This could be via a ResolvedVersion on the InstallSpec, or a cache of the latest version available for all channels. We'd have to figure out:

• When this data is updated (when doing an update probably, but how do we handle different tracked channels and do we update all of the latest versions even if we're only actually updating a single channel)?
• How do we use this latest version data to figure out if a version matches a channel? Do we match just the specific latest version (probably fragile) or also any previous version (more complicated).