[libgepub] Stop chapter number updates breaking navigation to anchor links

[Daniel Garcia Moreno <danigm src gnome org>]

commit dbd6d48429acfc41005de0a000298a42f5280530
Author: IBBoard <dev ibboard co uk>
Date:   Sat Apr 27 13:45:01 2019 +0100

    Stop chapter number updates breaking navigation to anchor links
    
    The reload_current_chapter() function can't check the current URI
    to see whether it has changed and *must* reload the chapter so that
    pagination changes are applied. Instead, we can temporarily remove
    the signal handler to prevent `notify::chapter` triggering a page
    reload that breaks anchor links.

 libgepub/gepub-widget.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/libgepub/gepub-widget.c b/libgepub/gepub-widget.c
index 25da498..9615227 100644
--- a/libgepub/gepub-widget.c
+++ b/libgepub/gepub-widget.c
@@ -249,6 +249,9 @@ set_current_chapter_by_uri (WebKitWebView  *web_view)
     // so we don't need to do anything here
 }
 
+static void
+reload_current_chapter (GepubWidget *widget);
+
 static void
 docready_cb (WebKitWebView  *web_view,
              WebKitLoadEvent load_event,
@@ -258,7 +261,11 @@ docready_cb (WebKitWebView  *web_view,
 
     if (load_event == WEBKIT_LOAD_FINISHED) {
         reload_length_cb (GTK_WIDGET (widget), NULL, NULL);
+        g_signal_handlers_disconnect_by_func (widget->doc,
+                                              reload_current_chapter, widget);
         set_current_chapter_by_uri (web_view);
+        g_signal_connect_swapped (widget->doc, "notify::chapter",
+                                  G_CALLBACK (reload_current_chapter), widget);
     }
 }