openlayers/openlayers — pull request #639 by ahocevar (2012-08-20 16:49:26+00:00)
Title: When using a buffer, the grid lacks rows/columns at the top/right.

This is because the threshold used for deciding when a column or row is shifted is too far to the bottom right. A tiny fix, but effective. A new test makes sure that we don't shift columns more than necessary when the layer is dragged.