Unsupported MyApplication Properties removed from Application.Designer.VB

[paul1956]

Visual Studio Version:
Version 16.8.0 Preview 3.2

Summary:
There are properties in MyApplication like MinimumSplashScreenDisplayTime that the VS UI does not (yet) support that need to be set manually in Application.Designer.VB, this was also true in Framework.

Steps to Reproduce:

1. Add Me.MinimumSplashScreenDisplayTime = 5000 to Sub New in Application.Designer.VB
2. Update something (for example IsSingleInstance) in VS UI
3. Rebuild

Expected Behavior:
The line Me.MinimumSplashScreenDisplayTime = 5000 is not modified
Actual Behavior:
The line Me.MinimumSplashScreenDisplayTime = 5000 is deleted
User Impact:
Application works differently under .Net then it did under Framework. MinimumSplashScreenDisplayTime was not supported in Framework UI but VS just left it alone. There are a few other properties that might me an issue for someone but this is the only one that I have seen frequently used.

[ocallesp]

@melytc For this GitHub, do we need to add a new property MinimumSplashScreenDisplayTime into the PP Application ?

[ocallesp]

This functionality was not implemented in the old property pages and implementing this requires a lot of work in the old project system. We should invest time implementing this in the new property pages.

[melytc]

Pending work: validate that this does not happen in the new experience.

[melytc]

Update: this is still happening in the new experience. If the user manually sets a property in the Application.Designer.VB file without first saving it or rebuilding the project, the change will be lost.

One note is that this file is not supposed to be edited: it states in the header that it is auto generated, and changes should come from the Project Properties. So, to fix this bug, the correct approach should be adding the properties to the UI, so a user is not in the need to change this file.

Hence, this would be fixed by the issue #8286 .