Changing font ligature settings may not apply them

[Tyriar]

VS Code issue: microsoft/vscode#255152

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• VS Code Version: 1.101.2
• OS Version: Windows 11 24H2

Steps to Reproduce:

1. Close all terminals.
2. Set terminal.integrated.fontLigatures.enabled to true.
3. Set terminal.integrated.fontLigatures.featureSettings such that characters look different (e.g. "'liga' 1, 'zero' 1").
4. Open a new terminal and run a program that outputs some text. The appearance of the outputted characters should be affected by the feature settings mentioned above.

Below is a screenshot demonstrating how this bug occurs. The font used in the terminal is JetBrains Mono, and the number 0 looks different (slashed) when font feature zero is set to on.

Note that switching zero off and then on again makes the character 0 look as expected.

Definitely looks like something is wrong: