Quick fix all for "Ignore this error message" can insert duplicate @ts-ignore comments if errors are on the same line

[mjbvz]

TypeScript Version: 2.7.0-dev.2018123

Search Terms:

• Quick fix all
• JavaScript
• Ts-ignore

Code
Create a js file with two errors on the same line:

// @ts-check

const a = 1;
const b = 2;

a = 1; b = 1;

Trigger quick fix all to add // @ts-ignore before this line

Expected behavior:
Returned edit inserts a single // @ts-ignore

Actual behavior:

getCombinedCodeFix returns two duplicate insertions for // @ts-ignore. This results in:

// @ts-check

const a = 1;
const b = 2;

// @ts-ignore
// @ts-ignore
a = 1; b = 1;

[Trace  - 15:40:36] Response received: getCombinedCodeFix (2112). Request took 1 ms. Success: true 
Result: {
    "changes": [
        {
            "fileName": "/Users/matb/projects/san/b.js",
            "textChanges": [
                {
                    "start": {
                        "line": 6,
                        "offset": 1
                    },
                    "end": {
                        "line": 6,
                        "offset": 1
                    },
                    "newText": "// @ts-ignore\n"
                },
                {
                    "start": {
                        "line": 6,
                        "offset": 1
                    },
                    "end": {
                        "line": 6,
                        "offset": 1
                    },
                    "newText": "// @ts-ignore\n"
                }
            ]
        }
    ]
}