[REG: 4.9.2->4.10.0]: When a CMake project has sub-projects with resource files, then it only shows the resources for the corresponding project

[REG: 4.9.2->4.10.0]: When a CMake project has sub-projects with resource files, then it only shows the resources for the corresponding project when accessing them inside the Design mode.

Previously in Qt Creator 4.9 it would show the resources from all the sub-projects in one making it easier to choose images from a sub-project which would be available at runtime.

To reproduce with the attached example do the following:

• Open the form.ui in Design mode
• Set an image on the label on the form

Note, in Qt Creator 4.9.2, the image0001.png would show up in the list of available resources, whereas in Qt Creator 4.10.0 it no longer does.