icons: Install Quassel-specific icons in hicolor for Qt4

Qt4 sadly doesn't support split icon themes yet, so our injection
and mechanism does not work.
Install the Quassel-specific icons into hicolor, so they should be
found at least in a proper system installation. Use the Oxygen
theme, because its layout matches the hicolor one (simplifying
the install rule), and it was default for Qt4 anyway.

diff --git a/icons/CMakeLists.txt b/icons/CMakeLists.txt
index 7f3f6a2..b989db4 100644 (file)
--- a/icons/CMakeLists.txt
+++ b/icons/CMakeLists.txt
@@ -55,6 +55,12 @@ if (WANT_MONO OR WANT_QTCLIENT)
         # hicolor contains the application icon in all relevant sizes
         install(DIRECTORY hicolor DESTINATION ${CMAKE_INSTALL_ICONDIR})
 
+        if (USE_QT4)
+            # Qt 4 doesn't seem to correctly load icons from injected themes
+            # Install Quassel-specific ones from Oxygen into hicolor as fallback
+            install(DIRECTORY oxygen/ DESTINATION ${CMAKE_INSTALL_ICONDIR}/hicolor)
+        endif()
+
         # For a system install, also copy to pixmaps
         if (CMAKE_INSTALL_PREFIX STREQUAL "/usr")
             install(FILES hicolor/48x48/apps/quassel.png DESTINATION /usr/share/pixmaps)