[kontact] [Bug 471120] New: FLATPAK: Kontact is unable to see applications like Okular and Gwenview for attachments.

[cberlinger]

https://bugs.kde.org/show_bug.cgi?id=471120

            Bug ID: 471120
           Summary: FLATPAK: Kontact is unable to see applications like
                    Okular and Gwenview for attachments.
    Classification: Applications
           Product: kontact
           Version: 5.23.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: mail
          Assignee: kdepim-bugs at kde.org
          Reporter: cberlinger at heritagerd.net
  Target Milestone: ---

SUMMARY
When Kontact (installed via Flathub's Flatpak) has an email with an attachment
(pdf, png), this attachment cannot be opened by double clicking on it in the
message viewer. If the attachment is double clicked, the user is greeting with
an "Open With" screen that does not show any system apps or other flatpaks. The
apps it does show what appears to be internal "programs" to the flatpak itself
(like kmail, kaddressbook). 

STEPS TO REPRODUCE
1. Install Kontact Flatpak via Flathub, Configure an email account that has
emails with standard attachments (pdf, png, jpg)
2. Click on an email with an attachment in the message list.
3. Inside the message preview, double click on the attachment in either the
header or within the email's body

OBSERVED RESULT
"Open with" window appears, but the appropriate installed apps are not in the
list.

EXPECTED RESULT
The flatpak should respect the system's "file associations" and launch the
correct corresponding mime-type app. 

SOFTWARE/OS VERSIONS
Operating System: Fedora Kinoite Linux 38
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.107.0
Qt Version: 5.15.9
Kernel Version: 6.3.7-200.fc38.x86_64 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 480 Graphics
Kontact Ver: Version 5.23.2 (23.04.2)
Install Method: Flathub flatpak

ADDITIONAL INFORMATION
Tested against Evolution flatpak in the same environment. It respected the
mime-types, so its unique to the Kontact flatpak vs a system-level issue.

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