In ODF (19.679.2 of ODF 1.3), the <table:covered-table-cell> element's
table:number-columns-repeated attribute has a default value of 1,
meaning the cell spans the cell to its right. However

In ODF (19.679.2 of ODF 1.3), the <table:covered-table-cell> element's
table:number-columns-repeated attribute has a default value of 1,
meaning the cell spans the cell to its right. However when the XSLT import
filter converts from SpreadsheetML's ss:MergeAcross to ODF's
table:number-columns-repeated, it always inserts a <table:covered-table-cell>
element, and then adds the table:number-columns-repeated attribute only if
it is greater than 1. This breaks when ss:MergeAcross="0", because ODF's
defaulting to 1 ends up occupying an extra empty cell to the right when it
shouldn't.

Fix this by only inserting the <table:covered-table-cell> when
ss:MergeAcross > 0.

Add a test document to prove this.

Fixes #100989 - SpreadsheetML: cell with ss:MergeAcross="0" gets an extra empty cell to the right
Patch by: me

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