Raise error early when port source is snapped into PML

[weiliangjin2021]

No description provided.

[QimingFlex]

Thanks, @weiliangjin2021 ! I tested it, and it looks great. I have one suggestion regarding the error message: could we provide more detailed instructions? For example:

Port {port.name} normal is less than 2 cells to the boundary on the +{'xyz'[normal_axis]} side. Please either increase the mesh resolution near the port or move the port away from the boundary.

[weiliangjin2021]

Thanks, @weiliangjin2021 ! I tested it, and it looks great. I have one suggestion regarding the error message: could we provide more detailed instructions? For example:

Port {port.name} normal is less than 2 cells to the boundary on the +{'xyz'[normal_axis]} side. Please either increase the mesh resolution near the port or move the port away from the boundary.

Good point!