pathbar: fix random segfaults on opening mounts from Desktop

Adapt and apply these four relevent Nautilus commits, which remove the code responsible for the segfaults:
*https://github.com/GNOME/nautilus/commit/e1ad3c05a6cd08c8cbf18ae53701dd742249d5fd#diff-f896071d07d34e87af94a18de95e4ea2
 "pathbar: add a path-event signal"

*https://github.com/GNOME/nautilus/commit/875efc324f8e91f2d157c7532fe5570c1de421c7#diff-f896071d07d34e87af94a18de95e4ea2
 "pathbar: remove unused code"

*https://github.com/GNOME/nautilus/commit/cfa51e6702ade6a8ca9045791773e6e10560262f
 "window-pane: use the path-event signal from NautilusPathBar" (now CajaPathBar)

*https://github.com/GNOME/nautilus/commit/2759def4968f89c1a2370ca5b2b91af84dc4afd3
 "pathbar: add a return value from path-event signal"

3 files changed, 84 insertions, 121 deletions

diff --git a/src/caja-navigation-window-pane.c b/src/caja-navigation-window-pane.c
index 91e5da94..aa700830 100644
--- a/src/caja-navigation-window-pane.c
+++ b/src/caja-navigation-window-pane.c
@@ -261,63 +261,21 @@ location_button_create (CajaNavigationWindowPane *pane)
 }
 
 static gboolean
-path_bar_button_pressed_callback (GtkWidget *widget,
-                                  GdkEventButton *event,
-                                  CajaNavigationWindowPane *pane)
-{
-    CajaWindowSlot *slot;
-    CajaView *view;
-    GFile *location;
-    char *uri;
-
-    caja_window_set_active_pane (CAJA_WINDOW_PANE (pane)->window, CAJA_WINDOW_PANE (pane));
-
-    g_object_set_data (G_OBJECT (widget), "handle-button-release",
-                       GINT_TO_POINTER (TRUE));
-
-    if (event->button == 3)
-    {
-        slot = caja_window_get_active_slot (CAJA_WINDOW_PANE (pane)->window);
-        view = slot->content_view;
-        if (view != NULL)
-        {
-            location = caja_path_bar_get_path_for_button (
-                           CAJA_PATH_BAR (pane->path_bar), widget);
-            if (location != NULL)
-            {
-                uri = g_file_get_uri (location);
-                caja_view_pop_up_location_context_menu (
-                    view, event, uri);
-                g_object_unref (G_OBJECT (location));
-                g_free (uri);
-                return TRUE;
-            }
-        }
-    }
+path_bar_path_event_callback (CajaPathBar *path_bar,
+                   GFile *location,
+                   GdkEventButton *event,
+                   CajaWindowPane *pane)
 
-    return FALSE;
-}
-
-static gboolean
-path_bar_button_released_callback (GtkWidget *widget,
-                                   GdkEventButton *event,
-                                   CajaNavigationWindowPane *pane)
 {
     CajaWindowSlot *slot;
     CajaWindowOpenFlags flags;
-    GFile *location;
     int mask;
-    gboolean handle_button_release;
-
-    mask = event->state & gtk_accelerator_get_default_mod_mask ();
-    flags = 0;
-
-    handle_button_release = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (widget),
-                            "handle-button-release"));
+    CajaView *view;
+    char *uri;
 
-    if (event->type == GDK_BUTTON_RELEASE && handle_button_release)
-    {
-        location = caja_path_bar_get_path_for_button (CAJA_PATH_BAR (pane->path_bar), widget);
+    if (event->type == GDK_BUTTON_RELEASE) {
+        mask = event->state & gtk_accelerator_get_default_mod_mask ();
+        flags = 0;
 
         if (event->button == 2 && mask == 0)
         {
@@ -334,26 +292,25 @@ path_bar_button_released_callback (GtkWidget *widget,
             caja_window_slot_info_open_location (slot, location,
                                                  CAJA_WINDOW_OPEN_ACCORDING_TO_MODE,
                                                  flags, NULL);
-            g_object_unref (location);
-            return TRUE;
         }
 
-        g_object_unref (location);
+         return FALSE;
     }
 
+    if (event->button == 3) {
+        slot = caja_window_get_active_slot (pane->window);
+        view = slot->content_view;
+        if (view != NULL) {
+            uri = g_file_get_uri (location);
+            caja_view_pop_up_location_context_menu (view, event, uri);
+            g_free (uri);
+        }
+        return TRUE;
+    }
     return FALSE;
 }
 
 static void
-path_bar_button_drag_begin_callback (GtkWidget *widget,
-                                     GdkEventButton *event,
-                                     gpointer user_data)
-{
-    g_object_set_data (G_OBJECT (widget), "handle-button-release",
-                       GINT_TO_POINTER (FALSE));
-}
-
-static void
 notebook_popup_menu_new_tab_cb (GtkMenuItem *menuitem,
     			gpointer user_data)
 {
@@ -364,46 +321,6 @@ notebook_popup_menu_new_tab_cb (GtkMenuItem *menuitem,
 }
 
 static void
-path_bar_path_set_callback (GtkWidget *widget,
-                            GFile *location,
-                            CajaNavigationWindowPane *pane)
-{
-    GList *children, *l;
-    GtkWidget *child;
-
-    children = gtk_container_get_children (GTK_CONTAINER (widget));
-
-    for (l = children; l != NULL; l = l->next)
-    {
-        child = GTK_WIDGET (l->data);
-
-        if (!GTK_IS_TOGGLE_BUTTON (child))
-        {
-            continue;
-        }
-
-        if (!g_signal_handler_find (child,
-                                    G_SIGNAL_MATCH_FUNC | G_SIGNAL_MATCH_DATA,
-                                    0, 0, NULL,
-                                    path_bar_button_pressed_callback,
-                                    pane))
-        {
-            g_signal_connect (child, "button-press-event",
-                              G_CALLBACK (path_bar_button_pressed_callback),
-                              pane);
-            g_signal_connect (child, "button-release-event",
-                              G_CALLBACK (path_bar_button_released_callback),
-                              pane);
-            g_signal_connect (child, "drag-begin",
-                              G_CALLBACK (path_bar_button_drag_begin_callback),
-                              pane);
-        }
-    }
-
-    g_list_free (children);
-}
-
-static void
 notebook_popup_menu_move_left_cb (GtkMenuItem *menuitem,
                                   gpointer user_data)
 {
@@ -766,8 +683,9 @@ caja_navigation_window_pane_setup (CajaNavigationWindowPane *pane)
 
     g_signal_connect_object (pane->path_bar, "path_clicked",
                              G_CALLBACK (path_bar_location_changed_callback), pane, 0);
-    g_signal_connect_object (pane->path_bar, "path_set",
-                             G_CALLBACK (path_bar_path_set_callback), pane, 0);
+
+    g_signal_connect_object (pane->path_bar, "path-event",
+                             G_CALLBACK (path_bar_path_event_callback), pane, 0);
 
     gtk_box_pack_start (GTK_BOX (hbox),
                         pane->path_bar,
diff --git a/src/caja-pathbar.c b/src/caja-pathbar.c
index 34a8438c..7e2b294a 100644
--- a/src/caja-pathbar.c
+++ b/src/caja-pathbar.c
@@ -31,14 +31,11 @@
 #include <libcaja-private/caja-dnd.h>
 #include <libcaja-private/caja-icon-dnd.h>
 #include "caja-pathbar.h"
-#include "caja-window.h"
-#include "caja-window-private.h"
-#include "caja-window-slot.h"
 
 enum
 {
     PATH_CLICKED,
-    PATH_SET,
+    PATH_EVENT,
     LAST_SIGNAL
 };
 
@@ -412,15 +409,16 @@ caja_path_bar_class_init (CajaPathBarClass *path_bar_class)
                       g_cclosure_marshal_VOID__OBJECT,
                       G_TYPE_NONE, 1,
                       G_TYPE_FILE);
-    path_bar_signals [PATH_SET] =
-        g_signal_new ("path-set",
+
+    path_bar_signals [PATH_EVENT] =
+       g_signal_new ("path-event",
                       G_OBJECT_CLASS_TYPE (path_bar_class),
-                      G_SIGNAL_RUN_FIRST,
-                      G_STRUCT_OFFSET (CajaPathBarClass, path_set),
-                      NULL, NULL,
-                      g_cclosure_marshal_VOID__OBJECT,
-                      G_TYPE_NONE, 1,
-                      G_TYPE_FILE);
+                      G_SIGNAL_RUN_FIRST | G_SIGNAL_RUN_LAST,
+                      G_STRUCT_OFFSET (CajaPathBarClass, path_event),
+                      NULL, NULL, NULL,
+                      G_TYPE_BOOLEAN, 2,
+                      G_TYPE_FILE,
+                      GDK_TYPE_EVENT);
 
     gtk_container_class_handle_border_width (container_class);
 }
@@ -1338,6 +1336,48 @@ button_clicked_cb (GtkWidget *button,
     g_signal_emit (path_bar, path_bar_signals [PATH_CLICKED], 0, button_data->path);
 }
 
+static gboolean
+button_event_cb (GtkWidget *button,
+		 GdkEventButton *event,
+		 gpointer   data)
+{
+        ButtonData *button_data;
+        CajaPathBar *path_bar;
+        GList *button_list;
+        gboolean retval;
+
+        button_data = BUTTON_DATA (data);
+        path_bar = CAJA_PATH_BAR (gtk_widget_get_parent (button));
+
+	if (event->type == GDK_BUTTON_PRESS) {
+		g_object_set_data (G_OBJECT (button), "handle-button-release",
+				   GINT_TO_POINTER (TRUE));
+	}
+
+	if (event->type == GDK_BUTTON_RELEASE &&
+	    !GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (button),
+						  "handle-button-release"))) {
+		return FALSE;
+	}
+
+        button_list = g_list_find (path_bar->button_list, button_data);
+        g_assert (button_list != NULL);
+
+        g_signal_emit (path_bar, path_bar_signals [PATH_EVENT], 0, button_data->path, event, &retval);
+
+	return retval;
+}
+
+static void
+button_drag_begin_cb (GtkWidget *widget,
+		      GdkDragContext *drag_context,
+		      gpointer user_data)
+{
+	g_object_set_data (G_OBJECT (widget), "handle-button-release",
+			   GINT_TO_POINTER (FALSE));
+}
+
+
 static CajaIconInfo *
 get_type_icon_info (ButtonData *button_data)
 {
@@ -1910,6 +1950,9 @@ make_directory_button (CajaPathBar  *path_bar,
     caja_path_bar_update_button_state (button_data, current_dir);
 
     g_signal_connect (button_data->button, "clicked", G_CALLBACK (button_clicked_cb), button_data);
+    g_signal_connect (button_data->button, "button-press-event", G_CALLBACK (button_event_cb), button_data);
+    g_signal_connect (button_data->button, "button-release-event", G_CALLBACK (button_event_cb), button_data);
+    g_signal_connect (button_data->button, "drag-begin", G_CALLBACK (button_drag_begin_cb), button_data);
     g_object_weak_ref (G_OBJECT (button_data->button), (GWeakNotify) button_data_free, button_data);
 
     setup_button_drag_source (button_data);
@@ -2063,8 +2106,6 @@ caja_path_bar_update_path (CajaPathBar *path_bar,
     path_bar->current_path = g_object_ref (file_path);
     path_bar->current_button_data = current_button_data;
 
-    g_signal_emit (path_bar, path_bar_signals [PATH_SET], 0, file_path);
-
     return result;
 }
 
diff --git a/src/caja-pathbar.h b/src/caja-pathbar.h
index 7fbcc786..fef82e7c 100644
--- a/src/caja-pathbar.h
+++ b/src/caja-pathbar.h
@@ -71,15 +71,19 @@ struct _CajaPathBarClass
 
     void (* path_clicked)   (CajaPathBar  *path_bar,
                              GFile             *location);
-    void (* path_set)       (CajaPathBar  *path_bar,
-                             GFile             *location);
+
+    void (* path_event)     (CajaPathBar  *path_bar,
+                             GdkEventButton   *event,
+                             GFile            *location);
 };
 
 GType    caja_path_bar_get_type (void) G_GNUC_CONST;
 
 gboolean caja_path_bar_set_path    (CajaPathBar *path_bar, GFile *file);
+
 GFile *  caja_path_bar_get_path_for_button (CajaPathBar *path_bar,
         GtkWidget       *button);
+
 void     caja_path_bar_clear_buttons (CajaPathBar *path_bar);
 
 GtkWidget * caja_path_bar_get_button_from_button_list_entry (gpointer entry);