FCustomPrimitiveDataCustomization::SetVectorColor is closing the colorpicker and only updating the first channel

When it updates the red channel, the Simple Construction Script (SCS) gets re-run (via AActor::RerunConstructionScripts) on the Blueprint Actor instance generating new instances of all its components. This leads to UEditorEngine::NotifyToolsOfObjectReplacement getting called as there's a mapping of the old components to the new ones. Which ultimately leads to SDetailsView::PostSetObject getting called, which has specific code for closing the color picker if SColorPicker::OptionalOwningDetailsView is invalid or doesn't match the invoking SDetailsView. SColorPicker::OptionalOwningDetailsView isn't set when the color picker is first opened in FCustomPrimitiveDataCustomization::OnMouseButtonDownColorBlock, so this means it's always closed.

issues working with the color picker and StaticMesh custom primitive data on Blueprint Actor instances in editor.

1. The color picker immediately closes upon selecting any color.
2. Only the first custom primitive data float (in this case the red channel of the color) is updated.