Bug: Link preview blink on ios18.1 simulator

[xinnjie]

Screen.Recording.2025-07-31.at.13.22.04.mov

Step to reproduce:

1. enable markdown support ChatView.messageUseMarkdown(true)
2. send a message contains string "https://deepwiki.com/"

while send a message contains string "[deepwiki](https://deepwiki.com/)" do not blink

Environment:

• IOS 18.1 simulator
• Exyte Chat 2.6.3

Also noted that, I can't reproduce this bug on IOS 18.2.1 with real IPhone 16

Error logs:

LPRawURLContentsFetcher<15>: failed subresource load: Domain=(null) Code=0 Error=(null)

LPRawURLContentsFetcher<15>: subresource load completed with error: Domain=NSURLErrorDomain Code=-999 Error=Error Domain=NSURLErrorDomain Code=-999 "cancelled" UserInfo={NSErrorFailingURLStringKey=https://deepwiki.com/apple-touch-icon-precomposed.png, NSErrorFailingURLKey=https://deepwiki.com/apple-touch-icon-precomposed.png, _NSURLErrorRelatedURLSessionTaskErrorKey=(
    "LocalDataTask <3CCD9591-36C7-453B-8804-FDB8676ED1DE>.<2>"
), _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <3CCD9591-36C7-453B-8804-FDB8676ED1DE>.<2>, NSLocalizedDescription=cancelled}

[matthewrfennell]

Hi, thanks for raising this! I was able to reproduce it on an iPhone 16 simulator, running iOS 18.6.

There is a minimum link preview width, and it seems this bug triggers when the text length comes close to that minimum width.

It looks like SwiftUI can't decide whether it wants to use that minimum width (in which case the text wraps onto two lines) or slightly greater (in which case it wraps onto a single line).

I would be interested to confirm whether this bug can trigger on device. Would you be ok to try, on device, a range of links that are almost the same size as the minimum link preview width?

[xinnjie]

@matthewrfennell

Also noted that, I can't reproduce this bug on IOS 18.2.1 with real IPhone 16

Link preview does not blink on real IPhone.

[tmolitor-stud-tu]

I had a one-time switch between two lines and one line on my physical iphone (happens every time I open the chat in Monal alpha). But it was only a simple link without preview.