Decorations rendered incorrectly in scaled editor

[somebee]

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

When the editor element or a parent is transformed using css, the decorations, selections and caret is rendered incorrectly. This happens on every line that contains a foreign element (ie. a color preview thumbnail).
If the theme font is not considered to be monospaced the bug will affect all lines.

Steps to Reproduce:

1. Go to vscode.dev
2. Create a simple css file with the content body { color: red; }
3. Scale the document document.body.style.transform = "scale(0.75)"
4. Select the code and/or move caret around to see wrong positions and sizes

[IanMatthewHuff]

Verified. Looks good now. Also verified the old broken behavior on non-insiders.