Rename g_unix_mount_monitor_new() to _get()

This is a singleton, but we have a function called _new() to get it.
What's worse is that the documentation makes no mention of this, and
actually specifically says that a new monitor will be created each time.

https://bugzilla.gnome.org/show_bug.cgi?id=742599

docs/reference/gio/gio-sections.txt

@@ -1556,6 +1556,7 @@ g_unix_mounts_get
 g_unix_mount_at
 g_unix_mounts_changed_since
 g_unix_mount_points_changed_since
+g_unix_mount_monitor_get
 g_unix_mount_monitor_new
 g_unix_mount_monitor_set_rate_limit
 g_unix_is_mount_path_system_internal

gio/glocaldirectorymonitor.c

@@ -109,7 +109,7 @@ g_local_directory_monitor_start (GLocalDirectoryMonitor *local_monitor)
       if (mount)
         g_unix_mount_free (mount);
 
-      local_monitor->mount_monitor = g_unix_mount_monitor_new ();
+      local_monitor->mount_monitor = g_unix_mount_monitor_get ();
       g_signal_connect_object (local_monitor->mount_monitor, "mounts-changed",
                                G_CALLBACK (mounts_changed), local_monitor, 0);
 #endif

gio/gunixmounts.c

@@ -1514,17 +1514,20 @@ g_unix_mount_monitor_set_rate_limit (GUnixMountMonitor *mount_monitor,
 }
 
 /**
- * g_unix_mount_monitor_new:
+ * g_unix_mount_monitor_get:
  *
- * Gets a new #GUnixMountMonitor. The default rate limit for which the
+ * Gets the #GUnixMountMonitor.
- * monitor will report consecutive changes for the mount and mount
- * point entry files is the default for a #GFileMonitor. Use
- * g_unix_mount_monitor_set_rate_limit() to change this.
  *
- * Returns: a #GUnixMountMonitor. 
+ * The mount monitor can be used to monitor for changes to the list of
- */
+ * mounted filesystems as well as the list of mount points (ie: fstab
+ * entries).
+ *
+ * Returns: (transfer full): the #GUnixMountMonitor.
+ *
+ * Since: 2.44
+ **/
 GUnixMountMonitor *
-g_unix_mount_monitor_new (void)
+g_unix_mount_monitor_get (void)
 {
   if (the_mount_monitor == NULL)
     {
@@ -1535,6 +1538,24 @@ g_unix_mount_monitor_new (void)
   return g_object_ref (the_mount_monitor);
 }
 
+/**
+ * g_unix_mount_monitor_new:
+ *
+ * Deprecated alias for g_unix_mount_monitor_get().
+ *
+ * This function was never a true constructor, which is why it was
+ * renamed.
+ *
+ * Returns: a #GUnixMountMonitor.
+ *
+ * Deprecated:2.44:Use g_unix_mount_monitor_get() instead.
+ */
+GUnixMountMonitor *
+g_unix_mount_monitor_new (void)
+{
+  return g_unix_mount_monitor_get ();
+}
+
 /**
  * g_unix_mount_free:
  * @mount_entry: a #GUnixMountEntry.

gio/gunixmounts.h

@@ -126,7 +126,9 @@ gboolean       g_unix_mount_points_changed_since    (guint64             time);
 
 GLIB_AVAILABLE_IN_ALL
 GType              g_unix_mount_monitor_get_type       (void) G_GNUC_CONST;
-GLIB_AVAILABLE_IN_ALL
+GLIB_AVAILABLE_IN_2_44
+GUnixMountMonitor *g_unix_mount_monitor_get            (void);
+GLIB_DEPRECATED_IN_2_44_FOR(g_unix_mount_monitor_get)
 GUnixMountMonitor *g_unix_mount_monitor_new            (void);
 GLIB_AVAILABLE_IN_ALL
 void               g_unix_mount_monitor_set_rate_limit (GUnixMountMonitor *mount_monitor,

gio/gunixvolumemonitor.c

@@ -209,7 +209,7 @@ static void
 g_unix_volume_monitor_init (GUnixVolumeMonitor *unix_monitor)
 {
 
-  unix_monitor->mount_monitor = g_unix_mount_monitor_new ();
+  unix_monitor->mount_monitor = g_unix_mount_monitor_get ();
 
   g_signal_connect (unix_monitor->mount_monitor,
 		    "mounts-changed", G_CALLBACK (mounts_changed),