Krzysztof Kotlarek bd0b558a89
FIX: paste the spreadsheet to the composer (#11163)
* FIX: paste the spreadsheet to the composer

If we paste spreadsheet with the missing label we receive
`"	this \n1	2"`

If we trim whitespace at the beginning then our later calculation to determine if it is a table is incorrect:

```
      const columns = rows.map((r) => r.split("\t").length);
      const isTable =
        columns.reduce((a, b) => a && columns[0] === b && b > 1)
```

https://meta.discourse.org/t/pasting-from-spreadsheet-wont-work-if-corner-cell-is-empty/169443
2020-11-13 13:01:22 +11:00
..
2019-03-15 15:23:57 +01:00