Last modified: 2014-02-28 23:04:22 UTC
Steps to reproduce: 1) Begin with an existing wikitext table (e.g., 4 rows, 4 columns). Open the page in VisualEditor. 2) Copy part of a different table or spreadsheet (e.g., 2 rows, 4 columns). 3) Place cursor inside a cell of the table in VisualEditor. 4) Paste the copied table. Results: VisualEditor places the entire new/rich-copied table, including wikitext formatting, inside the first cell. The wikitext parser does not deal very gracefully with table-within-table formatting. Desired outcome: VisualEditor should overwrite the contents of the cells with the new material.
This'll be… hard, to put it mildly. We should think about whether it's what we want to achieve in terms of UX before embarking on it.