Adding suffix to WDoubleSpinBox breaks validation
Setting a suffix on a WDoubleSpinBox breaks its built-in validation (i.e. all values entered by the pressing the spin controls are considered invalid). On the contrary, setting a suffix on a WSpinBox does not interfere with validation.
Additional info: Wt version 4.5.0 on Ubuntu 20.04.1 on WSL2 in Win10
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