[systemsettings] [Bug 416358] New: kcm_fonts: Cannot apply changes (button remains inactive)

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https://bugs.kde.org/show_bug.cgi?id=416358

            Bug ID: 416358
           Summary: kcm_fonts: Cannot apply changes (button remains
                    inactive)
           Product: systemsettings
           Version: 5.17.90
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: kcm_fonts
          Assignee: unassigned-bugs at kde.org
          Reporter: andreas.sturmlechner at gmail.com
                CC: unassigned-bugs at kde.org
  Target Milestone: ---

After the update to 5.17.90, making changes in the Fonts KCM does not activate
the Apply button. Running the KCM via kcmshell5 shows additional OK/Cancel
buttons and e.g. checking 'Force font DPI' will visibly flash the OK button
while Apply remains inactive, however using the OK button has no effect. After
restarting the KCM, old values are visible again.

Since I wanted to test Qt 5.14.0 scaling after applying b31852c4ca from
QTBUG-80967, I removed ~/.config/kcmfonts (from tty, in between two sessions)
which certainly worked to reset the values. However the above behavior
remained. For some reason though, the new file created by kcm_fonts had set
`forceFontDPI=144` which is weird.

SOFTWARE/OS VERSIONS
Operating System: Gentoo 
KDE Plasma Version: 5.17.90
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.0
Kernel Version: 5.4.10-gentoo
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-4790K CPU @ 4.00GHz
Memory: 15.4 GiB of RAM

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