Font selector doesn't show Helvetica font

[jmvivo]

Environment:

• Ubuntu 16.04 LTS
• Pencil 3.0.4 installed from ".deb" package

By default shapes uses found "Helvetica" but in Properties panel when select any shape on page the Font dropdown selected item doesn't matches with currently shown in the shape.

On the other hand, Font selector in tool bar shows correctly "Helvetica" but when you open selector this font ("Helvetica") doesn't appear in font list.

If you select a font the shapes updates its representation and dropdown shows value correctly.