Note: Initially committed as 7705e49bcd, but got reverted with
1f0520034a. Note includes fixes for unit tests.
If an asset library was pointing to the same path as the current file is saved
in, the assets from this library wouldn't be loaded. This is because the asset
library service assumed the absolute library root path is a way to uniquely
identify an asset library.
Instead, identify the asset library using both the root path and the library
type.
f622b4ce96