Mermaid cannot parse unicode characters #1877

The currently deployed mermaid version on https://stackedit.io/app barfs if the mermaid source-code contains non-latin unicode characters.

Plain ASCII works

```mermaid
flowchart TD
    src([packages/.../*.js]) --> eyes((eyes))
```

flowchart TD
    src([packages/.../*.js]) --> eyes((eyes))

U+2026 Unicode character fails

But U+2026 : HORIZONTAL ELLIPSIS breaks the mermaid parser in stackedit:

Error: Lexical error on line 2. Unrecognized text.
...D    src([packages/…/*.js]) --> eyes((e
----------------------^

```mermaid
flowchart TD
    src([packages/…/*.js]) --> eyes((eyes))
```

flowchart TD
    src([packages/…/*.js]) --> eyes((eyes))

Emoji character also fails

The same if we use emoji, such as U+1F440 : EYES:

Error: Lexical error on line 2. Unrecognized text.
...../*.js]) --> eyes((👀))
-----------------------^

```mermaid
flowchart TD
    src([packages/.../*.js]) --> eyes((👀))
```

flowchart TD
    src([packages/.../*.js]) --> eyes((👀))

Screenshot

Related work

This is potentially related to #1838.

And, of course, these examples work just fine here in GitHub and also in mermaid-js.github.io/mermaid-live-editor/