Line spacing doesn't change automatically when changing font size with selected text.

Steps to replicate

1. Create some multiline text
2. Switch to text tool and place cursor in the text (no text should be selected)
3. Change line spacing to a larger value, e.g. 2 (makes it easier to notice)
4. Change font-size to a larger value, e.g. 144 (makes it easier to notice) using the text toolbar
5. Select all the text by dragging (don't use Ctrl+A)
6. Change font-size back to a smaller value, e.g. 36 using the text toolbar

What happened?

text's line spacing doesn't change automatically change changing font size with selected text.

Looking at the xml, the parent text node's font-size is not changed (it should be). We can see this is not intended as changing the line height (using the toolbar) corrects the text node's font-size (see video)

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What should have happened?

text's line spacing should have change automatically when changing font size with selected text.

Inkscape Version and Operating System:

Inkscape 1.0 release on Windows 7