monitor: watch for removal of non-native mounts on GVolumeMonitor

Fix https://github.com/mate-desktop/caja/issues/1066 "Caja caches folders from usb drives/disk"

Nowadays, we rely on G_FILE_MONITOR_EVENT_UNMOUNTED to be emitted when a
mount disappears, since we already monitor the directory, in order to
switch the view to a different location.
Since non-native mounts very likely won't have file monitoring though,
we're not going to receive such events in that case, and fail to
redirect the view as a consequence.
This patch fixes it by listening to the mount-removed signal on
GVolumeMonitor when a monitor is requested for a non-native mount, and
emulating a file removal in that case.

Backport  Nautilus commit gitlab.gnome.org/GNOME/nautilus/commit/3891241ba760c59d284b7579dbd340651c8d4d29

note that caja_get_mounted_mount_for_root had to be added, while the equivalent Nautilus function was from a prior commit

1 files changed, 42 insertions, 0 deletions

diff --git a/libcaja-private/caja-file-utilities.c b/libcaja-private/caja-file-utilities.c
index 237f85d7..46f90b0a 100644
--- a/libcaja-private/caja-file-utilities.c
+++ b/libcaja-private/caja-file-utilities.c
@@ -756,6 +756,48 @@ caja_is_desktop_directory (GFile *dir)
     return g_file_equal (dir, desktop_dir);
 }
 
+GMount *
+caja_get_mounted_mount_for_root (GFile *location)
+{
+	GVolumeMonitor *volume_monitor;
+	GList *mounts;
+	GList *l;
+	GMount *mount;
+	GMount *result = NULL;
+	GFile *root = NULL;
+	GFile *default_location = NULL;
+
+	volume_monitor = g_volume_monitor_get ();
+	mounts = g_volume_monitor_get_mounts (volume_monitor);
+
+	for (l = mounts; l != NULL; l = l->next) {
+		mount = l->data;
+
+		if (g_mount_is_shadowed (mount)) {
+			continue;
+		}
+
+		root = g_mount_get_root (mount);
+		if (g_file_equal (location, root)) {
+			result = g_object_ref (mount);
+			break;
+		}
+
+		default_location = g_mount_get_default_location (mount);
+		if (!g_file_equal (default_location, root) &&
+		    g_file_equal (location, default_location)) {
+			result = g_object_ref (mount);
+			break;
+		}
+	}
+
+	g_clear_object (&root);
+	g_clear_object (&default_location);
+	g_list_free_full (mounts, g_object_unref);
+
+	return result;
+}
+
 /**
  * caja_get_pixmap_directory
  *