STR 1025: fixed illeagal acces to delted object. It was meant to set the dirty flag in the parent of course.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@4576 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

CHANGES

@@ -3,6 +3,7 @@ CHANGES IN FLTK 1.1.7
 	- Documentation fixes (STR #571, STR #648, STR #692, STR
 	  #730, STR #744, STR #745, STR #931, STR #942, STR #960,
 	  STR #969)
+	- Fixed illegal acces in Preferenes (STR #1025)
 	- Fixed x-offset problem in Help_Widget (STR #998)
 	- Clipboard will persist if owner window is hidden (STR #1019)
 	- Fixed handling of Win32 Device Contexts (STR #1007)

src/Fl_Preferences.cxx

@@ -1111,9 +1111,9 @@ char Fl_Preferences::Node::remove()
 	break;
       }
     }
+    parent_->dirty_ = 1;
   }
   delete this;
-  dirty_ = 1;
   return ( nd != 0 );
 }