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Executing a command like `ng generate component my-component` can sometimes lead to mangled Angular module files when inserting the component into `declaration` and adding the import. This happens if the file contains characters that are wider than one byte e.g. a copyright sign or an umlaut. Today it is expected to be able to use two byte long characters in code. The `UpdateBuffer` class operates using Buffer objects which use byte arrays internally. Using text node positions provided by the TypeScript library, these will not match up. This change looks up the textual position inside the Buffer and uses the correct index. Closes #7851, #7950