Problem with frameworks 5.86.0 and Konqueror

[David Faure]

Hi Stefano,

I think I just fixed that.
See konqueror commit and kio MR linked from 
https://bugs.kde.org/show_bug.cgi?id=442636

Cheers,
David.

On dimanche 19 septembre 2021 10:22:38 CEST Stefano Crocco wrote:
> Hello to everyone.
> I'm the current Konqueror maintainer and I need help about how to solve an
> incompatibility between the 5.86.0 version of KIO and Konqueror itself.
> 
> After upgrading KDE frameworks from version 5.85.0 to 5.86.0 on my system, I
> noticed that whenever I entered an http(s) URL in the location bar, the
> page would be opened in a new tab, instead of the current tab like it used
> to (and should) do.
> 
> After a bit of investigation, I came to the conclusion that the cause of
> this behaviour is the change introduced to
> KIO::DesktopExecParser::hasSchemeHandler() by the commit https://
> invent.kde.org/frameworks/kio/-/commit/
> 5fa55a2395cbfb6504e56bf71c869c8e49902e13
> 
> If I understand correctly, this commit removes the precedence previously
> given to kioslaves when there's both a kioslave and a protocol handler for
> the given URL. In Konqueror, this causes the problem I described because
> Konqueror relies in KRun::foundMimeType being called on a subclass of KRun
> to determine how to open an URL when its mimetype is initially unknown. In
> KIO 5.86.0 this doesn't happen anymore because
> KIO::DesktopExecParser::hasSchemeHandler (called from krun.cpp:460) now
> returns true for http(s) URLs, which causes KRun to directly launch the
> preferred application for those URLs. In my case, this is kfmclient_html,
> which is part of Konqueror itself. Depending on the user's settings,
> calling kfmclient_html could either open the URL in a new tab (my
> situation) or even in a new Konqueror window.
> 
> This problem doesn't only affect http(s) URLs: if I enter, for example, a
> man: URL, the man page isn't opened in Konqueror, as it used to, but in
> KHelpCenter, which is something which shouldn't happen at all.
> 
> Looking at the documentation and the source code for KRun I couldn't find a
> way to restore the pre-5.86.0 behaviour. Am I missing something? What would
> be the best way to solve this issue? Initially, when I hadn't yet realized
> that this issue wasn't only for http(s) URLs, I thought of handling those
> in a special way. However, given that the problem is more widespread, I
> don't think this can be done.
> 
> Please, add me as CC to any answer to this mail, as I'm not subscribed to
> this list. I hope that this is the correct list for this kind of issues. I
> had originally sent this mail to kde-devel, and they suggested me to send
> it here.
> 
> Thanks in advance
> 
> Stefano


-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE Frameworks 5