Add sharedConfig() accessor, to avoid manipulating a raw KConfig * as returned by config().

This is useful when using kconfigxt and some other code to read from the same
config file (e.g. KColorScheme::contrastF(config)) - no need to call KSharedConfig::openConfig
twice, just grab the KSharedConfig from the generated class.

REVIEW: 115960

src/core/kcoreconfigskeleton.cpp

@@ -1022,6 +1022,11 @@ const KConfig *KCoreConfigSkeleton::config() const
     return d->mConfig.data();
 }
 
+KSharedConfig::Ptr KCoreConfigSkeleton::sharedConfig() const
+{
+    return d->mConfig;
+}
+
 void KCoreConfigSkeleton::setSharedConfig(KSharedConfig::Ptr pConfig)
 {
     d->mConfig = pConfig;

src/core/kcoreconfigskeleton.h

@@ -1338,6 +1338,12 @@ public:
      */
     const KConfig *config() const;
 
+    /**
+     * Return the @ref KConfig object used for reading and writing the settings.
+     * @since 5.0
+     */
+    KSharedConfig::Ptr sharedConfig() const;
+
     /**
      * Set the @ref KSharedConfig object used for reading and writing the settings.
      */