https://bugs.kde.org/show_bug.cgi?id=398222

--- Comment #2 from Walter Lapchynski <w...@ubuntu.com> ---
While that makes sense, I think it's kind of missing the mark. Here's the
results of various actions:

 * `xdg-open mailto:w...@ubuntu.com` → opens email client with normal CPU usage
 * `firefox mailto:w...@ubuntu.com` → opens firefox, then email client with
normal CPU usage
 * `qutebrowser mailto:w...@ubuntu.com` → opens qutebrowser with normal CPU
usage
 * `falkon mailto:w...@ubuntu.com` → opens falkon with 100% CPU usage

And interestingly, mailto is not the only URI scheme that's problematic.

 * `xdg-open tel:towel.blinkenlights.nl` → opens falkon with 100% CPU usage
 * `firefox tel:towel.blinkenlights.nl` → opens firefox with a search for
tel:towel.blinkenlights.nl with normal CPU usage
 * `qutebrowser tel:towel.blinkenlights.nl` → opens qutebrowser with normal CPU
usage
 * `falkon tel:towel.blinkenlights.nl` → opens falkon with 100% CPU usage

>From this my guess is that there are two issues:

 1. Some bug in QtWebEngine that doesn't properly handle some URI schemes.
 2. Falkon lacks something that qutebrowser has where if it can't handle some
URI scheme, it gets stuck in a loop that qutebrowser avoids.

That said, what version can you not reproduce it in?

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