Bug 513230

Summary: FavIconRequestJob fails to retrieve larger favicons
Product: [Frameworks and Libraries] frameworks-kio Reporter: Ian Neal <iannbugzilla>
Component: generalAssignee: KIO Bugs <kio-bugs-null>
Status: CONFIRMED ---    
Severity: normal CC: kdelibs-bugs-null, nicolas.fella
Priority: NOR    
Version First Reported In: 6.20.0   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Ian Neal 2025-12-12 00:02:09 UTC 
SUMMARY
FavIconRequestJob should be able to deal with larger favicons

STEPS TO REPRODUCE
1. Request favicon.ico from https://www.ybs.co.uk/o/ybs-theme/images/
2. 
3. 

OBSERVED RESULT
Get KIO::FavIconRequestJob error 163 and no favicon.ico retrieved

EXPECTED RESULT
The favicon is retrieved.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Fedora Linux 42
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.9.3

ADDITIONAL INFORMATION
Most web browsers can make use of the larger favicons so KIO framework should do the same.
Comment 1 Nicolas Fella 2025-12-18 14:32:46 UTC 
There's a somewhat arbitrary size limit in the code: https://invent.kde.org/frameworks/kio/-/blob/master/src/gui/faviconrequestjob.cpp#L189

Changing the limit would be easy, but I'm hesitant about removing it entirely
Comment 2 Ian Neal 2025-12-18 15:33:31 UTC 
Biggest one I've found is 256x256 which was around 100k. Maybe take the limit to 0x20000 ?