Ok, I did some analysis of what happens when you set defaults in kde default
applications.
As I mentioned above this has nothing to do with kde systemsettings which is
just a cute view of kcontrol meant for kubuntu.
When you select another default application for email/browsing etc. kcontrol
(which is part of kdebase) runs the following function.
void CfgBrowser::save(KConfig *) {
KConfig *config = new KConfig("kdeglobals");
config->setGroup("General");
QString exec;
if (radioExec->isChecked())
{
exec = lineExec->text();
if (m_browserService && (exec == m_browserExec))
exec = m_browserService->storageId(); // Use service
else
exec = "!" + exec; // Litteral command
}
config->writePathEntry("BrowserApplication", exec, true, true);
config->sync();
delete config;
KIPC::sendMessageAll(KIPC::SettingsChanged);
emit changed(false);
}
If you check the headers, you'll find the function writePathEntry is part of
the kconfigbase class.
This function will write a entry to the users home directory at
~/.kde/share/config/some_file (depending on the setting you're changing.)
So to detect changes you'd want something that can detect
KIPC::sendMessageAll(KIPC::SettingsChanged);
The true problem here is as mentioned above, the fact that Thunderbird
doesn't check the browser environment variable but goes directly by
calling x-www-browser which is system wide defined by update-
alternatives and therefore should not be changed on a multi-user
platform.
So yes, there's where I stop the problem seems to be with thunderbird
and not with kde for it not checking user specific variables (where are
they set in gnome?) for the moment.
--
Kubuntu setting default components don't affect gnome/gtk apps
https://bugs.launchpad.net/bugs/52670
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