Either make QtSvg an optional dependency, or add it to the pyproject.toml extras

[mdickinson]

Pyface with the PySide6 backend currently requires QtSvg: it's imported from unconditionally in pyface.ui.qt.resource_manager. However, recent versions of PySide6 on EDM don't include QtSvg as a dependency, leading to failures.

We should either list QtSvg as an explicit dependency in the optional-dependencies part of pyproject.toml, or update the resource_manager code to make QtSvg optional (it would be easy to make the import local to the place it's needed).

[itziakos]

Sorry @mdickinson the PySide6 is missing runtime dependencies. The new Pyside build will fix this.