5.6.1 KDE Widget Style

[René J.V. Bertin]

Hi,

>IIRC the AppImage should use the Breeze style. Maybe something broke there?

It wouldn't if the plugin isn't included, for instance ;)

>
>In general though, we cannot really use your system's widget style, 
>because the style is a plugin and might not be binary-compatible between 
>the Qt version the AppImage ships, and your host system.

True, but /methinks that the OP would install KDevelop from his distribution if it were one that provides up-to-date packages. IOW, there's a good chance that his Qt5 version is not newer than the one in the AppImage.
The simpler reason why plugins from the system aren't used could be that the embedded Qt simply isn't configured to look in the system plugin paths. That can probably be fixed by setting QT_PLUGIN_PATH, unless the AppImage wrapper unsets that variable?

R