[canvas] Fix coincident points elimination when selecting stroke end …

…tangent. In case of coincident endpoints, the bogus increment would either read past the elements points, or select the first unused point for quadratics and lines.

sketches/canvas/build.sh

@@ -13,7 +13,6 @@ mkdir -p $BINDIR
 clang -g $FLAGS $LIBS $INCLUDES -o $BINDIR/example_canvas main.c
 
 cp $LIBDIR/liborca.dylib $BINDIR/
-cp $LIBDIR/mtl_renderer.metallib $BINDIR/
-cp $SRCDIR/ext/dawn/bin/libwebgpu.dylib $BINDIR/
+cp $LIBDIR/libwebgpu.dylib $BINDIR/
 
 install_name_tool -add_rpath "@executable_path" $BINDIR/example_canvas

src/graphics/wgpu_renderer.c

@@ -2094,7 +2094,7 @@ void oc_wgpu_encode_stroke_element(oc_wgpu_canvas_encoding_context* context,
     }
     *endPoint = controlPoints[endPointIndex];
 
-    for(int i = endPointIndex - 1; i >= 0; i++)
+    for(int i = endPointIndex - 1; i >= 0; i--)
     {
         if(controlPoints[i].x != endPoint->x
            || controlPoints[i].y != endPoint->y)