Non-BMP code points don't work on Linux

[tig]

Unicode issue related to: #2610

See also: #2616

Try as I might, I can't seem to get the CursesDriver to output non-BMP code points.

NetDriver works well:

I've gone as far code like this:

					if (rune.IsBmp) {
						Contents [Row, Col, 0] = rune.Value;
						Curses.addch (Contents [Row, Col, 0]);
					} else {
						var column = Col;
						ReadOnlySpan<char> remainingInput = rune.ToString ().AsSpan ();
						while (!remainingInput.IsEmpty) {
							// Decode
							OperationStatus opStatus = Rune.DecodeFromUtf16 (remainingInput, out Rune result, out int charsConsumed);

							if (opStatus != OperationStatus.Done) {
								result = Rune.ReplacementChar;
							}
							Contents [Row, column, 0] = result.Value;
							Contents [Row, column, 1] = CurrentAttribute;
							
							Curses.attrset (Contents [Row, column, 1]);
							Curses.mvaddch (Row, column, Contents [Row, column, 0]);

							// Slice and loop again
							remainingInput = remainingInput.Slice (charsConsumed);
							column++;
						}
						Curses.move (Row, Col);
					}
					Curses.attrset (curAttr);
				}

CursesDriver results in this:

[BDisp]

You are in the right way, good catch. I'm working on a new PR that get rid the NStack dependence that fix #92. What you are relating here for a long time I already realized the same.

[tig]

You are in the right way, good catch. I'm working on a new PR that get rid the NStack dependence that fix #92. What you are relating here for a long time I already realized the same.

Uh-ohl I started the same thing today. I've made huge progress, starting just with ConsoleDriver and subclasses.

I'll push my PR and you can see what I've done....