This problem creates a second one :
- Reproduce T125454 steps. (view F3300781)
- Place focus at the end of second line.
- With directional key, go at the begin of the second line.
- Try to press <Left key>. (again and again)
- It does nothing whereas it should place the cursor at the end of first line.
- Note that <CTRL> + <Left> enables to do it.
This problem occurs on Fedora with Firefox 44 but not with Chromium 46.