Make cmake call update-mime-database during install.

CMakeLists.txt

@@ -16,6 +16,9 @@ set(KF5_MIN_VERSION "5.57.0")
 find_package(ECM 5.15.0 REQUIRED CONFIG)
 set(CMAKE_MODULE_PATH ${cantor_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH} ${ECM_MODULE_PATH} )
 
+set( SharedMimeInfo_MINIMUM_VERSION "1.3" ) #TODO: What is the minimum required version?
+find_package(SharedMimeInfo ${SharedMimeInfo_MINIMUM_VERSION} REQUIRED)
+
 find_package(Qt5 5.8.0 CONFIG REQUIRED
     Core
     Widgets

src/CMakeLists.txt

@@ -47,6 +47,7 @@ install( PROGRAMS org.kde.cantor.desktop  DESTINATION  ${KDE_INSTALL_APPDIR} )
 install( FILES cantor_shell.rc  DESTINATION  ${KDE_INSTALL_KXMLGUI5DIR}/cantor )
 install( FILES cantor.knsrc  DESTINATION  ${KDE_INSTALL_KNSRCDIR} )
 install( FILES cantor.xml DESTINATION ${XDG_MIME_INSTALL_DIR} )
+update_xdg_mimetypes(${XDG_MIME_INSTALL_DIR})
 
 #########################################################################
 # KPART SECTION