Tabs do not align to tab stops when emoji are used

[aaronfranke]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.74.3
• OS Version: macOS 13.1

Steps to Reproduce:

1. Copy this text into VS Code:

Hello	There
Hello👋	There

2. Observe that the "There" text on the line with the emoji is shifted to the left:

3. Speculation: My guess is that this is caused by the emoji being between 1 and 2 characters wide, but it "takes up" 2 characters of the tab's width, so the tab is displayed with one character of width, which is wrong.

4. The desired behavior is that the "There" text is aligned, just like on GitHub. A tab's width should not be calculated based on the characters to the left of it, it should only ever have its right edge at the next tab stop, such that the text to its right starts at the next tab stop.