Renderer splits slides twice even when the there is enough space

Hello,

xubuntu 11.04, trunk 1636

1) Create a custom slide with a number on each row.
2) Send the custom slide live/preview it.
3) Edit the custom slide and add a "soft break" one line later than the number of lines which will fit (if 12 lines fit, then add the soft break after the 13th line)
4) Send the custom slide live/preview it.

Result:
You will have three slides, although it should only be two.

Expected:
The "soft break" should be ignored (in this case), because the slides which are split by the "soft break" do fit on one slide.

However, if the second part does not fit the "soft break" should not be ignored, as it now fulfils its purpose.

Cheers