=== bugfix ===

[ #4434 ] 3d view transform propereties float "Dim" fields lock
float comparison was inaccurate, resulted in code thinking  DimX was changed always
with change not noticeable.
Replaced it with comparison against small epsilon.

source/blender/src/drawview.c

@@ -2068,7 +2068,7 @@ void do_viewbuts(unsigned short event)
 
 			/* for each axis changed */
 			for (axis = 0; axis<3; axis++) {
-				if (old_dims[axis] != ob_dims[axis]) {
+				if (fabs(old_dims[axis] - ob_dims[axis]) > 0.0001) {
 					if (old_dims[axis] > 0.0) {
 						ratio = ob_dims[axis] / old_dims[axis]; 
 						if (link_scale) {