Main UI shows blank screen only on iOS 15.x

[hmerk]

The problem

After updating to SNAPSHOT #3686 (issue might have been introduced earlier), Main UI only shows a blank screen at iPadOS 15.8, so I can no longer use my older iPads.
No issue at iOS 17.1 as far as I could test.

Expected behavior

I would expect the same behavior like using iOS 17.1

Steps to reproduce

Nothing special, just use the above named iOS/iPadOS version with any browser or openHAB‘s app.

Your environment

I would post this information If I could see anything in MainUI

Browser console

not available at Apple mobile devices AFAIK

Browser network traffic

See above

Additional information

None

[florian-h05]

I can reproduce this in BrowserStack on iOS 15.x and 16.x devices, where you can access the dev tools and browser console:

SyntaxError: Invalid regular expression: invalid group specifier name

Some googling said, that Safari seems to have a problem with lookbehind, I guess the issue is in a dependency of MainUI. Unfortunatyle I cannot track down the root cause of this ...

Do you know on which version it worked?

[florian-h05]

You don't need to try to find out which snapshot version you came from. I luckily got an old iPhone 6s with iOS 15.8 to try out which of the latest MainUI commits broke it ... some good old try and error.

With #2055 MainUI broke for iOS 15.8 ... I just found out why:

openhab-webui/bundles/org.openhab.ui/web/src/components/sse-events-mixin.js

Line 38 in aef0a6b

const [command, ...segments] = payload.value.trim().split(/(?<!\\):/)

There we have the unsupported regex.