Fix getCodeFixesAtPosition for ts(2339) thows error False expression: Token end is child end

[jeanp413]

Fixes #43191

[jessetrinity]

I see that other code fixes make use of the same flag but I'm not 100% sure what it does. Can you point to where the truncation was causing the problem?

[jeanp413]

@jessetrinity There are some places in checker.ts that checks the length and if it's too long replaces the remaining text with ... ${properties.length - i} more ...

if (checkTruncationLength(context) && (i + 2 < properties.length - 1)) {
    typeElements.push(factory.createPropertySignature(/*modifiers*/ undefined, `... ${properties.length - i} more ...`, /*questionToken*/ undefined, /*type*/ undefined));
    addPropertyToElementList(properties[properties.length - 1], context, typeElements);
    break;
}

And then when trying to format the text (which is invalid in formatting.ts) to apply the corresponding text edits it would throw an error

[jessetrinity]

Makes sense, thanks!