classDiagram: return value "std::unique_ptr" does not display

[sebastianbergt]

Describe the bug
The return value of makeToy does not display correctly with std:: or likely any other namespace prefix.

To Reproduce
Just try to render the example below.
If std:: is omitted, it works again.

Expected behavior
Display the makeToy line as +makeToy() std::unique_ptr<Toy>

Screenshots
Wrong display:

Code Sample

classDiagram
    class ToyFactory {
        <<factory>>
        +makeToy() std::unique_ptr~Toy~ 
    }

Loading

live editor

Desktop (please complete the following information):
Tried on

• OS: Ubuntu 20.04 x86_64
• Browser Chrome
• Version 103.0.5060.134

Smartphone (please complete the following information):
Did not test it on a smartphone.

[matthew-limbinar]

Probably this is an instance of #1635.

[jgreywolf]

Closing in favor of #1635