More unused parameters and local variables.

src/Snap.cpp

@@ -289,7 +289,10 @@ bool SnapManager::SnapToPoints(Track *currentTrack,
       return true;
    }
 
-   size_t indexInThisTrack = -1;
+   // indexInThisTrack is ONLY used if count > 0
+   // and is initialised then, so we can 'initialise' it
+   // to anything to keep compiler quiet.
+   size_t indexInThisTrack = left;
    size_t countInThisTrack = 0;
    for (i = left; i <= right; ++i)
    {