With GL we can have binding aliasing. Keep searching for a used binding

* If we have multiple bindings aliasing the same slot, we want to keep going if
  the first one we find is unused to see if the slot is aliased with one that
  *is* used. We'll still use the last unused one if we don't find any used at
  all (and with aliasing any one we pick is as valid as another).

qrenderdoc/Windows/PipelineState/GLPipelineStateViewer.cpp

@@ -922,7 +922,11 @@ void GLPipelineStateViewer::setShaderState(const GLPipe::Shader &stage, RDLabel
         {
           shaderCBuf = &bind;
           map = &mapping.constantBlocks[bind.bindPoint];
-          break;
+
+          // if this one is used, break immediately. Otherwise keep going to see if we find one that
+          // is used
+          if(map->used)
+            break;
         }
 
         idx++;