Stage name shadowing an image that was previously used is not a valid definition location for the original line

[rcjsuen]

The definition of alpine on the first line should not cause the editor to focus on the alpine stage name on the second line as the two are not the same given that the declaration of the shadowed name comes after the original image name.

FROM alpine
FROM scratch AS alpine

const lib = require("dockerfile-language-service");
const service = lib.DockerfileLanguageServiceFactory.createLanguageService();
const document = `FROM alpine
FROM scratch AS alpine`;

console.log(service.computeDefinition({ uri: "file:///tmp/Dockerfile" }, document, { line: 0, character: 8 }));

{
  uri: 'file:///tmp/Dockerfile',
  range: {
    start: { line: 1, character: 16 },
    end: { line: 1, character: 22 }
  }
}