Comment 31 for bug 168164

Super exciting stuff!

As for the issue of Inkscape assuming font sizes, I think we need to assume it's px unless the font size explicitly includes a unit type.

Issue 1: When using "em", the preview size in the Text & Font dialog looks like it's still using px to calculate it. (probably related to your number 3)

Issue 2: If you are working with text and have the cursor in the toolbar's "Font size" box, if you change the unit type in preferences, the size/unit is not updated in the UI until changing or un/re-selecting text objects. (this is minor, but could confuse users)

Issue 3: One-way sync issue with T&F dialog. If you change the font size in the text toolbar it does not update in the dialog (changing the font face does, that's why I bring it up).

Issue 4: I seem to have hit an issue with em where I set the size (unit type em) to something, but when I change the font face it resets the size to 1.