[Bug Bash][Unstable] There will be a blank line at the bottom of the ‘Package source’ dropdown list after the machine-wide package source is disabled

[v-luzh]

NuGet Product Used

Visual Studio Package Management UI

Product Version

VS Main/11322.50 + NuGet Client Dev/7.3.0.48

Worked before?

It is a regression since it reproes on D18.0\11304.174 (Unified Settings ‘Options’ dialog), but doesn’t repro on D16.11\36711.23 (the old ‘Options’ dialog).

Impact

It bothers me. A fix would be nice

Repro Steps & Context

Note:

1. Repro rate: 80%.

Repro Steps:

1. Create a C# Console App (.NET 10.0) in VS and open the project-level PM UI.
2. Make sure you have several package sources in ‘nuget.config’ file under the path ‘C:\Users[UserName]\AppData\Roaming\NuGet’ (as the lines below).

    key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3"
    key="Microsoft Visual Studio Offline Packages" value="C:\Program Files (x86)\Microsoft SDKs\NuGetPackages\"

3. Click the menu ‘Tools->Options->NuGet Package Manager->Package Source’ and delete all the package sources.
4. Close the VS, reload the solution (to avoid meeting the bug 14693), click ‘Tools->Options->NuGet Package Manager->Package Source’ and add several package sources (a local package source & nuget.org in this instance).
5. Select a package source (for example: the ‘nuget.org’) in the ‘Package source’ dropdown list and install a package.
6. Click ‘Tools->Options->NuGet Package Manager->Package Source’ and make sure the machine-wide package source disabled.
7. Go to the PM UI and expand the ‘Package source’ dropdown list to observe.

Expected Result:

No blank line at the bottom of the ‘Package source’ dropdown list.

Actual Result:

There will be a blank line at the bottom of the ‘Package source’ dropdown list as the screenshot below.

[donnie-msft]

It looks like there are some new issues with the VS common Combobox control. We'll want to get input from the IDE team when they are back from the holidays.

[donnie-msft]

I found a related problem where the horizontal text is truncated, so width also isn't correctly being re-sized. The Fluent Combobox appears to have some bug with redrawing after content changes which would explain why blank lines are shown as well.
Changing the content a second time fixes the Combobox's styling.