.-> dotted arrows cause syntax error in newest Mermaid release

[tomjn]

Description

Recently our github mermaid diagrams broke, and they started failing in the mermaid live tester.

I tracked this down to .->, removing dotted lines fixed the issue.

Steps to reproduce

This diagram generates syntax errors:

flowchart TD
    start[First]--"label"-->second[Second]
    second.->third[[Third]]
    second.->fourth(Fourth)

The same diagram using --> instead of .-> does not:

flowchart TD
    start[First]--"label"-->second[Second]
    second-->third[[Third]]
    second-->fourth(Fourth)

Screenshots

Code Sample

flowchart TD
    start[First]--"label"-->second[Second]
    second.->third[[Third]]
    second.->fourth(Fourth)

Setup

• Mermaid version: 10.9.0
• Browser and Version: Chrome

Suggested Solutions

No response

Additional Context

No response

[tomjn]

The test case can be simplified further:

flowchart TD
    one.->two

[tomjn]

Further investigation reveals that this works:

flowchart TD
    one .-> two

But this does not:

flowchart TD
    one.-> two

Previously it worked

[sidharthv96]

Thanks for the detailed report @tomjn! Github's version jump was very broad, 10.0.2 to 10.8.0, more than a year's work. Although we keep backwards compatibility in the syntax as a very important criteria (even in major version changes), some things get through unintentionally.

We'll try to investigate what the issue was, but .-> working had not been intentional, as the documentation mentions -.-> as a dotted arrow.