I just had play on my Glo using FW3.5.0. It looks like this firmware will not use any line height other than what can be set from the slider.
What I did was to use the utilities plugin to set the line height for ten books. The books were all in one series to make it easy to go through them. I started from 0.5 and stepped up by 0.1 for each book. The plugin sets the line spacing in the content_settings table for each book. It can also update the config file.
When I opened the books, most were using 1.0 as the line spacing. Only those that I set to 1.1, 1.2 and 1.5 used the set values. And when I connected and looked at the content_settings table, the values had been changed 1.0. I did another check of a few other values and had the same result. I also tried with the config file set to 2.8, to see if it was using the config file value if it wasn't a match, and they were still changed to 1.0.
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