improved large data paste performance #1705
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When pasting large data, call updateTableReference/updateSelectionFromCoords for each additional row or column.
updateTableReference/updateSelectionFromCoords updates the DOM and recalculate the layout, which will result in a performance loss.
PR can reduce the number of calls to updateTableReference/updateSelectionFromCoords by extending the paste area in advance.
Tests are added at commit 20d61c9.
Compare with commit ff63058.
NOTE: can be done in previous versions by using parseCSV and insertRow/Column in onbeforepaste.
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Sry, i'm not good at english.