Comment 0 for bug 1689899

When creating a text node with two superscript "items" the last one will be saved without font-size value.

Simplified result:
<text
       xml:space="preserve"
       style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:10.58333302px;line-height:125%;font-family:'DejaVu Sans';-inkscape-font-specification:'DejaVu Sans';letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:0.26458332px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
       x="49.877354"
       y="136.47275"
       id="text4269"><tspan
         sodipodi:role="line"
         id="tspan4267"
         x="49.877354"
         y="136.47275"
         style="stroke-width:0.26458332px">qwe<tspan
   style="font-size:17.19791591%;baseline-shift:super"
   id="tspan4271">qwe<tspan
   style="font-size:;baseline-shift:baseline"
   id="tspan4273">qwe</tspan></tspan></tspan></text>

As you can see it contains "font-size:;baseline".

Steps to reproduce:
1. Create new file.
2. Write some text.
3. Select part of the text and make it superscript.
4. Select part of the superscripted text and make it superscript again.
5. Save the file.

Tested on Inkscape 0.92+devel 15686, Gentoo Linux x86_64