Fixed jumpy window scrolling
Selecting and editing cells in overlays
Walkontable setting function can now be invoked with any number of parameters
Fixed computing last row and last column for clone WOTs
Prevent main WOT to scroll when selecting cells in clones
Fixed highlighting selected area in scrolled table
Fixed selecting a range of cells in clones, without scrolling the main WOT
Fixed ColHeaderSpec
Fixed columnStrategy.visibleCellCount()
Fixed Core_view tests
Fixed RowHeaders tests