bubnikv 43f2171446 Partial fix of v2.2.0 alpha2 Unhandled exception - extrusion width #3482 ...

Exceptions thrown by Flow calculation were made explicit classes derived
from std::invalid_argument.

The PresetHints::recommended_thin_wall_thickness() newly catches these
exceptions and it shows the reason of why the hint is invalid.

2020-02-18 12:26:56 +01:00

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