Index: src/Project.cpp
===================================================================
RCS file: /cvsroot/audacity/audacity-src/src/Project.cpp,v
retrieving revision 1.456
diff -u -r1.456 Project.cpp
--- src/Project.cpp	30 Sep 2009 19:31:44 -0000	1.456
+++ src/Project.cpp	5 Oct 2009 05:51:46 -0000
@@ -1288,7 +1288,13 @@
 
    // Add 1/4 of a screen of blank space to the end of the longest track
    mViewInfo.screen = ((double) panelWidth) / mViewInfo.zoom;
-   mViewInfo.total = mTracks->GetEndTime() + mViewInfo.screen / 4;
+   double newTotal = mTracks->GetEndTime() + mViewInfo.screen / 4;
+
+   // Don't decrease total if the track panel doesn't want it.
+   if (newTotal > mViewInfo.total || !mTrackPanel->DoNotDecreaseTotalLength())
+   {
+      mViewInfo.total = newTotal;
+   }
 
    if (mViewInfo.h > mViewInfo.total - mViewInfo.screen) {
       mViewInfo.h = mViewInfo.total - mViewInfo.screen;
Index: src/TrackPanel.h
===================================================================
RCS file: /cvsroot/audacity/audacity-src/src/TrackPanel.h,v
retrieving revision 1.140
diff -u -r1.140 TrackPanel.h
--- src/TrackPanel.h	10 Sep 2009 06:28:25 -0000	1.140
+++ src/TrackPanel.h	5 Oct 2009 05:51:47 -0000
@@ -222,6 +222,10 @@
    void UpdateTrackVRuler(Track *t);
    void UpdateVRulerSize();
 
+   // Returns true if it would be inappropriate to decrease viewInfo.total due
+   // to current activity (during sliding is one case... there may be others)
+   bool DoNotDecreaseTotalLength() { return mMouseCapture == IsSliding; };
+
  private:
    #ifdef EXPERIMENTAL_MIXER_BOARD
       MixerBoard* GetMixerBoard();