[gimp-help-2] Add non-documented features in Navigation dialog

[Julien Hardlin <jhardlin src gnome org>]

commit c72464d067faaf8077298edd0baf66cabef4b2b7
Author: Julien Hardelin <jm hard wanadoo fr>
Date:   Sun Mar 31 08:45:38 2013 +0200

    Add non-documented features in Navigation dialog

 src/dialogs/navigation-dialog.xml |   31 ++++++++++++++++++++++++++-----
 1 files changed, 26 insertions(+), 5 deletions(-)
---
diff --git a/src/dialogs/navigation-dialog.xml b/src/dialogs/navigation-dialog.xml
index 39ee00a..8a0243d 100644
--- a/src/dialogs/navigation-dialog.xml
+++ b/src/dialogs/navigation-dialog.xml
@@ -2,9 +2,10 @@
 <!DOCTYPE sect2 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
                        "http://www.docbook.org/xml/4.3/docbookx.dtd";>
 <!-- section history:
+  2013-03-31 j.h: added non-documented features
   2012-05-25 j.h: no change for v2.8
-  2008-12-13 j.h: updated to v2.6  2007-09-30 j.h : revised v.2.4. Documented
-buttons.
+  2008-12-13 j.h: updated to v2.6
+  2007-09-30 j.h : revised v.2.4. Documented buttons.
   2006-03-11 lexa: made file docbook compliant
 -->
 <sect2 id="gimp-navigation-dialog">
@@ -26,8 +27,25 @@ buttons.
     The Navigation dialog is designed to offer easy movement around the active
     image if the zoom is set higher than what the image window can display. If
     this is the case, there is an inversely colored rectangle that shows the
-    location of the current view area in respect to the image. This
-    rectangular outline can be dragged to change the viewing region.
+    location of the current view area in respect to the image.
+  </para>
+  <para><!--2013-03-31-->
+    To change the viewing region:
+    <itemizedlist>
+      <listitem>
+        <para>
+          Click and drag the rectangular area.
+        </para>
+      </listitem>
+      <listitem>
+        <para>
+          Use <keycap>Shift</keycap> and mouse-wheel to move horizontally,
+          <keycap>Alt</keycap> and mouse-wheel to move vertically. The mouse
+          pointer must be on the rectangular area in the shape of a grabbing
+          hand.
+        </para>
+      </listitem>
+    </itemizedlist>
   </para>
 
   <sect3>
@@ -99,7 +117,10 @@ buttons.
         <listitem>
           <para>
             It allows easy zoom level control, more precise than with the
-            <link linkend="gimp-view-zoom">Zoom</link> command.
+            <link linkend="gimp-view-zoom">Zoom</link> command. This slider can
+            also be moved using the mouse wheel when the mouse pointer is on
+            the slider, or <keycap>Ctrl</keycap> and mouse wheel when the mouse
+            pointer is on the rectangular area.
           </para>
         </listitem>
       </varlistentry>