Comment 14 for bug 1642133

Hmm, opening up the XML Editor I can see what's happening in my case above.

When I select all and change the font size it's only effecting the svg:flowPara font-sizes not the svg:flowRoot font-size. Technically this makes sense although caught me out.

The line-height adjustments on select all are effecting the svg:flowPara line-height, when nothing is selected but the cursor is in the text box it's effecting the svg:flowRoot line-height.

The line height adjustments seem to be working as intended. To change the flowRoot font-size selecting the text box with no cursor active allows adjusting of the flowRoot font-size.

Bug is behind the keyboard. May be that others have been caught out by this.