[gtk+/gtk-3-22] ScrolledWindow: Dodge possible surplus disconnects

[Daniel Boles <dboles src gnome org>]

commit 423cd8e73e63dc27a2749a3b83613edbd35df767
Author: Daniel Boles <dboles src gnome org>
Date:   Fri Sep 1 16:03:36 2017 +0100

    ScrolledWindow: Dodge possible surplus disconnects
    
    In case the outgoing Adjustment for whatever reason has other handlers
    referring to this SW, be sure to avoid disconnecting any but our own.

 gtk/gtkscrolledwindow.c |   14 ++++++++++++--
 1 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 3058d3b..25e5d1c 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -2258,7 +2258,12 @@ gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
       if (old_adjustment == hadjustment)
        return;
 
-      g_signal_handlers_disconnect_by_data (old_adjustment, scrolled_window);
+      g_signal_handlers_disconnect_by_func (old_adjustment,
+                                            gtk_scrolled_window_adjustment_changed,
+                                            scrolled_window);
+      g_signal_handlers_disconnect_by_func (old_adjustment,
+                                            gtk_scrolled_window_adjustment_value_changed,
+                                            scrolled_window);
 
       gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
       gtk_range_set_adjustment (GTK_RANGE (priv->hscrollbar), hadjustment);
@@ -2329,7 +2334,12 @@ gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
       if (old_adjustment == vadjustment)
        return;
 
-      g_signal_handlers_disconnect_by_data (old_adjustment, scrolled_window);
+      g_signal_handlers_disconnect_by_func (old_adjustment,
+                                            gtk_scrolled_window_adjustment_changed,
+                                            scrolled_window);
+      g_signal_handlers_disconnect_by_func (old_adjustment,
+                                            gtk_scrolled_window_adjustment_value_changed,
+                                            scrolled_window);
 
       gtk_adjustment_enable_animation (old_adjustment, NULL, 0);
       gtk_range_set_adjustment (GTK_RANGE (priv->vscrollbar), vadjustment);