[kmail2] [Bug 360000] New: KMail grabs default PCM device on notification

[Patrick Auernig via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=360000

            Bug ID: 360000
           Summary: KMail grabs default PCM device on notification
           Product: kmail2
           Version: 5.1
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: misc
          Assignee: kdepim-bugs at kde.org
          Reporter: patrick.auernig at gmail.com

The soundcard of my PC stopped working after a while, so I started monitoring
the usage of PCM devices in my system.

What I found is that KMail grabs the default PCM device of the system when a
notification dialog pops up (in my case it was the sieve script upload
confirmation dialog).

If the device is already in use (by pulseaudio), audio keeps working as it
should.

It seems that some notifications bypass pulseaudio and use ALSA directly, but
do not release the device afterwards.

Closing the application releases the device again, but its really annoying.

Reproducible: Always

Steps to Reproduce:
1. Open the sieve script editor
2. Klick OK to close the editor
3. Default PCM device gets used by KMail

Actual Results:  
No audio over default soundcard

Expected Results:  
Sound keeps working

Arch Linux package version: 15.12.2-1
Kernel: 4.4.1-2-ARCH x86_64

output of fuser -av
                     USER        PID ACCESS COMMAND
/dev/snd/pcmC0D0p:   valeth    F...m kmail

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