Version: (using Devel) Installed from: Compiled sources I have compiled and installed a new applet from source (after having changed the CMakeLists.txt to install the applet to my local SVN build). However, the applet did not show up in the "Add widget" dialog. The only way to make it appear was to exit KDE and start a new session. Instead, I would prefer that the "Add widget" dialog check for newly added widgets when opened.
You could simply restart plasma instead of the whole KDE session.
In fact, I did try `pkill -SIGTERM plasma; plasma` but it did not change anything for me.
iirc Plasma applets are using those *.desktop files and they are cached by kbuildsyscoca. So, a "kbuildsyscoca --noincremental" (not sure if the option is needed) should update that list.
*** This bug has been marked as a duplicate of 152530 ***