Reevalting a Webpage stream with a new URL returns previous stream result

[azmec]

Expected behavior

When reevaluating a program containing a Webpage stream with a new url argument, the stream should evaluate to the content at that new URL or a number indicating the percentage of the page that is loaded.

Actual behavior

Instead, the stream evaluates to the previous stream result.

1. Copy and paste the following code into a Wordplay project.

   chat: Chat()
   url: "https://www.google.com" … ∆ chat … chat
   webpage: Webpage(url)
   
   Stage([Phrase(webpage → '')] place: Place(0m 0m -15m))

2. Enter a complete HTTPS URL into the message box and hit Enter.
3. Step back one input in the program timeline.
4. Step forward 20 steps in the timeline. Observe that Webpage has been passed a new argument.
5. Step forward 2 steps. Observe that Webpage is evaluating to the previous value despite the new argument.

Screenshots

Below is an image of the Wordplay IDE at Step 4.

Below is an image of the Wordplay IDE at Step 5.

Environment

Desktop

• OS + version: Void Linux x86_64 6.6.35_1
• Browser + version: Firefox 127.0.2_1

[amyjko]

Excellent issue, thank you for the reproduction steps!