In KIFACE_I::end_common save the 'common' configuration variables loaded in...

In KIFACE_I::end_common save the 'common' configuration variables loaded in KIFACE_I::begin_common (the background color and the page border flag)

common/kiface_i.cpp

@@ -123,6 +123,11 @@ bool KIFACE_I::start_common( int aCtlBits )
 
 void KIFACE_I::end_common()
 {
+    /* Save common preferences; the background still uses the old legacy
+     * color numbers, not the new names */
+    m_bm.m_config->Write( showPageLimitsKey, g_ShowPageLimits );
+    m_bm.m_config->Write( backgroundColorKey, int( g_DrawBgColor ) );
+
     m_bm.End();
 }