Handling spanned cell in pasting scenarios

[jodator]

📝 Provide a description of the new feature

This case requires #6120 & #6121 to proceed. Add tests and fix potential issues of pasting tables with spanned cells.

A table feature already provides a table layout post-fixer that handles edge cases in which such a broken layout could be created in the editor (most often during collaboration). However, the paste must be aware of such a condition and minimize the effect of a potentially broken layout by trimming the cells that extend over the rectangle selection.

Cases to handle

• selection has spans at the edges (might not work well or is blocked)
• non-rectangular selection (might be tricky) - require to split table cell similarly when changing headings algorithm
• non-rectangular pasted table

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[jodator]

Also handle this case: #6786 (comment).