NLA - Bugfix:

Scale and Repeat fields in NLA Transform Properties panel will now ignore negative values instead of clamping them to a near-zero value, which can easily be confused with the strip being 'destroyed'. This shouldn't affect other interface elements, as this change has only been used here. 

(Note: negative scaling should be avoided)

source/blender/include/BIF_interface.h

@@ -164,6 +164,7 @@ struct AutoComplete;
 #define BUT_TOGDUAL (33<<9)
 #define ICONTOGN (34<<9)
 #define FTPREVIEW (35<<9)
+#define NUMABS	(36<<9)
 #define BUTTYPE	(63<<9)