Added support for sorting desktop icons from right to left.

--- xfdesktop-4.4.2/settings/behavior-settings.c
+++ xfdesktop-4.4.2-new/settings/behavior-settings.c
@@ -37,6 +37,7 @@
     OPT_ICONSSYSTEMFONT,
     OPT_ICONSICONSIZE,
     OPT_ICONSFONTSIZE,
+    OPT_ICONSRTLLAYOUT,
 #endif
 };
 
@@ -54,6 +55,7 @@
 static gboolean desktop_icons_use_system_font = TRUE;
 static guint desktop_icons_font_size = 12;  /* default, i guess */
 static guint desktop_icons_icon_size = 32;  /* default */
+static gboolean desktop_icons_rtl_layout = FALSE;
 #endif
 
 static void
@@ -85,6 +87,13 @@
             gtk_widget_set_sensitive(bd->frame_sysfont,
                                      !desktop_icons_use_system_font);
             break;
+
+        case OPT_ICONSRTLLAYOUT:
+            desktop_icons_rtl_layout = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(w));
+            mcs_manager_set_int(bd->plugin->manager,
+                                "icons_rtl_layout", BACKDROP_CHANNEL,
+                                desktop_icons_rtl_layout ? 1 : 0);
+            break;
 #endif
         default:
             g_warning("xfdesktop menu: got invalid checkbox ID");
@@ -202,6 +211,15 @@
     if(setting && setting->data.v_int > 0)
         desktop_icons_icon_size = setting->data.v_int;
 
+    setting = mcs_manager_setting_lookup(plugin->manager,
+                                         "icons_rtl_layout",
+                                         BACKDROP_CHANNEL);
+    if(setting)
+        desktop_icons_rtl_layout = setting->data.v_int ? TRUE : FALSE;
+    else
+        mcs_manager_set_int(plugin->manager, "icons_rtl_layout",
+                            BACKDROP_CHANNEL, 0);
+    
 #endif  /* ENABLE_DESKTOP_ICONS */
 }
 
@@ -350,6 +368,15 @@
     
     gtk_widget_set_sensitive(bd->frame_sysfont, !desktop_icons_use_system_font);
     
+    chk = gtk_check_button_new_with_mnemonic(_("Sort icons from _right to left"));
+    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(chk),
+                                 desktop_icons_rtl_layout);
+    g_object_set_data(G_OBJECT(chk), "xfce-chknum",
+                      GUINT_TO_POINTER(OPT_ICONSRTLLAYOUT));
+    gtk_widget_show(chk);
+    gtk_box_pack_start(GTK_BOX(bd->vbox_icon_settings), chk, FALSE, FALSE, 0);
+    g_signal_connect(G_OBJECT(chk), "toggled", G_CALLBACK(set_chk_option), bd);
+    
     if(desktop_icon_style == XFCE_DESKTOP_ICON_STYLE_NONE)
         gtk_widget_set_sensitive(bd->vbox_icon_settings, FALSE);
     
--- xfdesktop-4.4.2/src/xfce-desktop-settings.c
+++ xfdesktop-4.4.2-new/src/xfce-desktop-settings.c
@@ -269,6 +269,14 @@
         mcs_setting_free(setting);
         setting = NULL;
     }
+
+    if(MCS_SUCCESS == mcs_client_get_setting(mcs_client, "icons_rtl_layout",
+                                             BACKDROP_CHANNEL, &setting))
+    {
+        xfce_desktop_set_icons_rtl_layout(desktop, setting->data.v_int);
+        mcs_setting_free(setting);
+        setting = NULL;
+    }
 #endif
     
     for(i = 0; i < nmonitors; i++) {
@@ -414,6 +422,11 @@
         xfce_desktop_set_icon_font_size(desktop, setting->data.v_int);
         return TRUE;
     }
+
+    if(!strcmp(setting->name, "icons_rtl_layout")) {
+        xfce_desktop_set_icons_rtl_layout_and_mirror(desktop, setting->data.v_int);
+        return TRUE;
+    }
 #endif
     
     /* get the screen and monitor number */
--- xfdesktop-4.4.2/src/xfce-desktop.c
+++ xfdesktop-4.4.2-new/src/xfce-desktop.c
@@ -96,6 +96,7 @@
     gboolean icons_use_system_font;
     guint icons_font_size;
     guint icons_size;
+    gboolean rtl_layout;
     GtkWidget *icon_view;
     gdouble system_font_size;
 #endif
@@ -244,6 +245,8 @@
             xfdesktop_icon_view_set_icon_size(XFDESKTOP_ICON_VIEW(desktop->priv->icon_view),
                                               desktop->priv->icons_size);
         }
+        xfdesktop_icon_view_set_rtl_layout(XFDESKTOP_ICON_VIEW(desktop->priv->icon_view),
+                                           desktop->priv->rtl_layout);
         gtk_widget_show(desktop->priv->icon_view);
         gtk_container_add(GTK_CONTAINER(desktop), desktop->priv->icon_view);
     }
@@ -534,6 +537,7 @@
     GTK_WINDOW(desktop)->type = GTK_WINDOW_TOPLEVEL;
 #ifdef ENABLE_DESKTOP_ICONS
     desktop->priv->icons_use_system_font = TRUE;
+    desktop->priv->rtl_layout = FALSE;
 #endif
     
     gtk_window_set_type_hint(GTK_WINDOW(desktop), GDK_WINDOW_TYPE_HINT_DESKTOP);
@@ -879,6 +883,45 @@
 }
 
 void
+xfce_desktop_set_icons_rtl_layout(XfceDesktop *desktop,
+                                  gboolean rtl_layout)
+{
+    g_return_if_fail(XFCE_IS_DESKTOP(desktop));
+
+#ifdef ENABLE_DESKTOP_ICONS
+    if(rtl_layout == desktop->priv->rtl_layout)
+        return;
+
+    desktop->priv->rtl_layout = rtl_layout;
+
+    if(desktop->priv->icon_view) {
+        xfdesktop_icon_view_set_rtl_layout(XFDESKTOP_ICON_VIEW(desktop->priv->icon_view),
+                                           rtl_layout);
+    }
+#endif
+}
+
+void
+xfce_desktop_set_icons_rtl_layout_and_mirror(XfceDesktop *desktop,
+                                             gboolean rtl_layout)
+{
+    g_return_if_fail(XFCE_IS_DESKTOP(desktop));
+
+#ifdef ENABLE_DESKTOP_ICONS
+    if(rtl_layout == desktop->priv->rtl_layout)
+        return;
+
+    desktop->priv->rtl_layout = rtl_layout;
+
+    if(desktop->priv->icon_view) {
+        xfdesktop_icon_view_set_rtl_layout(XFDESKTOP_ICON_VIEW(desktop->priv->icon_view),
+                                           rtl_layout);
+        xfdesktop_icon_view_mirror(XFDESKTOP_ICON_VIEW(desktop->priv->icon_view));
+    }
+#endif
+}
+
+void
 xfce_desktop_set_icon_font_size(XfceDesktop *desktop,
                                 guint font_size_points)
 {
--- xfdesktop-4.4.2/src/xfce-desktop.h
+++ xfdesktop-4.4.2-new/src/xfce-desktop.h
@@ -87,6 +87,12 @@
 void xfce_desktop_set_icon_font_size(XfceDesktop *desktop,
                                      guint font_size_points);
 
+void xfce_desktop_set_icons_rtl_layout(XfceDesktop *desktop,
+                                       gboolean rtl_layout);
+
+void xfce_desktop_set_icons_rtl_layout_and_mirror(XfceDesktop *desktop,
+                                                  gboolean rtl_layout);
+
 void xfce_desktop_set_session_logout_func(XfceDesktop *desktop,
                                           SessionLogoutFunc logout_func);
 
--- xfdesktop-4.4.2/src/xfdesktop-icon-view.c
+++ xfdesktop-4.4.2-new/src/xfdesktop-icon-view.c
@@ -100,6 +100,7 @@
     
     guint icon_size;
     guint font_size;
+    gboolean rtl_layout;
     
     NetkScreen *netk_screen;
     PangoLayout *playout;
@@ -364,6 +365,7 @@
     
     icon_view->priv->icon_size = DEFAULT_ICON_SIZE;
     icon_view->priv->font_size = DEFAULT_FONT_SIZE;
+    icon_view->priv->rtl_layout = FALSE;
     
     icon_view->priv->native_targets = gtk_target_list_new(icon_view_targets,
                                                           icon_view_n_targets);
@@ -1680,6 +1682,12 @@
         
     icon_view->priv->nrows = (height - SCREEN_MARGIN * 2) / CELL_SIZE;
     icon_view->priv->ncols = (width - SCREEN_MARGIN * 2) / CELL_SIZE;
+
+    if(icon_view->priv->rtl_layout) {
+        gint remainder = width - icon_view->priv->ncols * CELL_SIZE - SCREEN_MARGIN * 2;
+        icon_view->priv->xorigin += remainder;
+        icon_view->priv->width -= remainder;
+    }
         
     DBG("CELL_SIZE=%d, TEXT_WIDTH=%d, ICON_SIZE=%d", CELL_SIZE, TEXT_WIDTH, ICON_SIZE);
     DBG("grid size is %dx%d", icon_view->priv->nrows, icon_view->priv->ncols);
@@ -2201,9 +2209,16 @@
     
     maxi = icon_view->priv->nrows * icon_view->priv->ncols;
     for(i = 0; i < maxi; ++i) {
-        if(!icon_view->priv->grid_layout[i]) {
-            *row = i % icon_view->priv->nrows;
-            *col = i / icon_view->priv->nrows;
+        gint index;
+        guint16 cur_row = i % icon_view->priv->nrows;
+        guint16 cur_col = i / icon_view->priv->nrows;
+        if(icon_view->priv->rtl_layout) {
+            cur_col = icon_view->priv->ncols - 1 - cur_col;
+        }
+        index = cur_col * icon_view->priv->nrows + cur_row;
+        if(!icon_view->priv->grid_layout[index]) {
+            *row = cur_row;
+            *col = cur_col;
             return TRUE;
         }
     }
@@ -2946,6 +2961,58 @@
     return icon_view->priv->font_size;
 }
 
+void
+xfdesktop_icon_view_set_rtl_layout(XfdesktopIconView *icon_view,
+                                   gboolean rtl_layout)
+{
+    g_return_if_fail(XFDESKTOP_IS_ICON_VIEW(icon_view));
+
+    if(rtl_layout == icon_view->priv->rtl_layout)
+        return;
+
+    icon_view->priv->rtl_layout = rtl_layout;
+
+    if(GTK_WIDGET_REALIZED(GTK_WIDGET(icon_view))) {
+        xfdesktop_grid_do_resize(icon_view);
+        gtk_widget_queue_draw(GTK_WIDGET(icon_view));
+    }
+}
+
+gboolean
+xfdesktop_icon_view_get_rtl_layout(XfdesktopIconView *icon_view)
+{
+    g_return_val_if_fail(XFDESKTOP_IS_ICON_VIEW(icon_view), 0);
+    return icon_view->priv->rtl_layout;
+}
+
+void
+xfdesktop_icon_view_mirror(XfdesktopIconView *icon_view)
+{
+    gint col, row;
+    for(col = 0; col < icon_view->priv->ncols/2; col++) {
+        gint col2 = icon_view->priv->ncols - 1 - col;
+        for(row = 0; row < icon_view->priv->nrows; row++) {
+            gint idx1 = col * icon_view->priv->nrows + row;
+            gint idx2 = col2 * icon_view->priv->nrows + row;
+
+            XfdesktopIcon *icon1 = icon_view->priv->grid_layout[idx1];
+            XfdesktopIcon *icon2 = icon_view->priv->grid_layout[idx2];
+
+            xfdesktop_grid_set_position_free(icon_view, row, col2);
+            if(icon1) {
+                xfdesktop_icon_set_position(icon1, row, col2);
+                xfdesktop_grid_unset_position_free(icon_view, icon1);
+            }
+
+            xfdesktop_grid_set_position_free(icon_view, row, col);
+            if(icon2) {
+                xfdesktop_icon_set_position(icon2, row, col);
+                xfdesktop_grid_unset_position_free(icon_view, icon2);
+            }
+        }
+    }
+}
+
 GtkWidget *
 xfdesktop_icon_view_get_window_widget(XfdesktopIconView *icon_view)
 {
--- xfdesktop-4.4.2/src/xfdesktop-icon-view.h
+++ xfdesktop-4.4.2-new/src/xfdesktop-icon-view.h
@@ -103,6 +103,12 @@
                                        gint font_size_points);
 guint xfdesktop_icon_view_get_font_size(XfdesktopIconView *icon_view);
 
+void xfdesktop_icon_view_set_rtl_layout(XfdesktopIconView *icon_view,
+                                        gboolean rtl_layout);
+gboolean xfdesktop_icon_view_get_rtl_layout(XfdesktopIconView *icon_view);
+
+void xfdesktop_icon_view_mirror(XfdesktopIconView *icon_view);
+
 GtkWidget *xfdesktop_icon_view_get_window_widget(XfdesktopIconView *icon_view);
 
 G_END_DECLS