Emojis not working in TableView? (NStack or gui.cs issue potentially)

I get this exception from NStack:

System.ArgumentException: Value in the surrogate range and isn't part of a surrogate pair!
   at System.Rune..ctor(Char ch)
   at System.Rune.op_Implicit(Char ch)
   at Terminal.Gui.TableView.<>c.<CalculateMaxCellWidth>b__92_1(Char c) in C:\git\saffron\deps\gui.cs\Terminal.Gui\Views\TableView.cs:line 1123
   at System.Linq.Enumerable.Sum[TSource](IEnumerable`1 source, Func`2 selector)
   at Terminal.Gui.TableView.CalculateMaxCellWidth(DataColumn col, Int32 rowsToRender, ColumnStyle colStyle) in C:\git\saffron\deps\gui.cs\Terminal.Gui\Views\TableView.cs:line 1123
   at Terminal.Gui.TableView.CalculateViewport(Rect bounds, Int32 padding)+MoveNext() in C:\git\saffron\deps\gui.cs\Terminal.Gui\Views\TableView.cs:line 1081
   at System.Collections.Generic.LargeArrayBuilder`1.AddRange(IEnumerable`1 items)
   at System.Collections.Generic.EnumerableHelpers.ToArray[T](IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Terminal.Gui.TableView.Redraw(Rect bounds) in C:\git\saffron\deps\gui.cs\Terminal.Gui\Views\TableView.cs:line 200

The data in the TableRow column contains the emojis, 🤖🧠.

The “offending” line of code is:

spaceRequired = Math.Max (spaceRequired, GetRepresentation (Table.Rows [i] [col], colStyle).Sum (c => Rune.ColumnWidth (c)));

My guess is, this code is assuming a single char is a valid Rune, which is not always true. Should/could it instead use DecodeRune in a loop, calling Rune.ColumnWidth on each and summing the results?

Or, is this kind of emoji/data not supported on gui.cs and I should avoid? Thanks.

[kierenj]

Aha! public static int ColumnWidth(char c) in that PR 😃 😃

I’ll try it, thanks

[kierenj]

That’s the Windows driver, on Windows Terminal, font is MesloLGL NF

(https://github.com/romkatv/dotfiles-public/tree/master/.local/share/fonts/NerdFonts)