Change in Gantt parsing eliminates end-of-line "#" comments

[colindean]

Description

I use end-of-line # comments to update the date on rolling line items more easily in a few Gantt charts I maintain as a workaround until #3532 is implemented adding a now() or similar as a valid enddate.

I'm able to run once in a while a regex find-and-replace script that simply updates the date.

In playing around in mermaid.live, I found that it seems like no # comments are working. I tried a few other characters and they all fail. Looking at the documentation, I see that %% on its own line works, but know from 18 months of maintaining this that # worked at the end of a line, too.

Steps to reproduce

Put this code into Mermaid.live:

gantt
    title A Gantt Diagram
    dateFormat  YYYY-MM-DD
    section Section
    A task           :a1, 2014-01-01, 30d # comment
    Another task     :after a1  , 20d
    section Another
    Task in sec      :2014-01-12  , 12d
    another task      : 24d

and note that it doesn't work on GitHub anymore, either.

gantt
    title A Gantt Diagram
    dateFormat  YYYY-MM-DD
    section Section
    A task           :a1, 2014-01-01, 30d # comment
    Another task     :after a1  , 20d
    section Another
    Task in sec      :2014-01-12  , 12d
    another task      : 24d

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Code Sample

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Setup

• Mermaid version: 11.3.0 (what's on Mermaid.live right now)
• Browser and Version: Firefox 129.0.2 on macOS 14.6.1.

I was using Mermaid in this context primarily through GitHub Enterprise, and when my company updated to GHES 3.13, we got Mermaid updates through it wherein this previously working functionality was broken.

Suggested Solutions

1. Restore end-of-line # comment functionality
2. Enable %% to work at the end of a line.

Additional Context

No response