Comment 14 for bug 1675825

I am experiencing this bug, too. (Kubuntu 17.10, Inkscape 0.92.2 (5c3e80d, 2017-08-06))

How to reproduce it:

1. Open a new document.
2. Create a text field.
3. Type a few lines of text with a default font size (it was 30 in my case) and a default line spacing (it was 125%).
4. Select the text.
5. Change the font size for the selected text to a much smaller value (I set it to 8).

--> Result: You will see that the line spacing does not change. The value of line spacing still shows 125% but it is not true.

6. Now try to change the line spacing to 1%.

--> Result: The line spacing only decreases a little bit. But for sure, it is not 1% of font height.

7. Now try to click several times in the "^" button next to the line spacing value window. In this way, you want to change the line spacing value by +1 %.

--> Result: The values in the window begin to change very quickly and you loose control over it -- you can't stop it. In my case, it stopped at 1000%.

8. Changing units does not help.