Terminal: Emoji layout is not correct on Windows 10 1903

[fcharlie]

• VSCode Version:

:: code --version
1.34.0
a622c65b2c713c890fcf4fbf07cf34049d5fe758
x64

• OS Version:

:: cmd ver
Microsoft Windows [版本 10.0.18362.145]

I have a simple code to verify that the terminal supports displaying emoji. Visual Studio Code 1.34 does display emoji on Windows 10 1903, but the layout of emoji is confusing, which is characterized by insufficient character width or partial garbled display.

The complete example can clone fcharlie/bela and then use cmake to build and run the corresponding fmt_test.exe.

The final output uses WriteConsoleW: https://github.com/fcharlie/bela/blob/master/src/bela/stdwriter.cc

Windows Terminal commitid: 4c47631bf4aa907aad4f7088bc7edc7e5cde11b9 In addition to some emoji is too small, other emoji displays are correct. As shown below:

Visual Studio Code shows that emoji is confusing：

The errors between Terminus and Visual Studio Code are the same as the following:

Does this issue occur when all extensions are disabled?: Yes/No

[fcharlie]

@Tyriar This should be the problem caused by xterm.js.

[Tyriar]

Unicode version detection is tricky, this is tracked in xtermjs/xterm.js#1709