Description:
When the document is RTL and I'm adding a table the table default directions is LTR even the document is RTL.

So when I marked the table and click on the RTL button the cells switch to RTL, but when I'm standing on the last cell of the table and press the TAB key to add a new row a new row was added but whole table content switch to LTR again.

I recorded my screen and upload the clip:
http://dev.3460.co.il/upn/download.php?id=85&token=nAAeTy5rfY8l2rnZHvZt9yKei5l4DQlQ

Miki Barzilay

Steps to Reproduce:
1. Switch document to RTL direction
2. Add a table - the cells are LTR
3. When I'm marking the table and click on the RTL direction button the cells direction switch to RTL but when I'm adding a new row by standing on the last cell of the table and click on the TAB key the whole table switch to LTR.


Actual Results:  
Table is LTR even document is RTL

Expected Results:
Table should be RTL when document is RTL


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:


User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0