Seedlet-blocks custom-line-height support opt-in now required.

[Addison-Stavlo]

I ran into this change while working on some FSE blocks and testing with the Seedlet-Blocks theme. Perhaps this is already on your radar but I figured it would be worth a heads-up. (@kjellr - I hope you don't mind but since you authored the Seedlet p2 post I figured you would be the right person to ping.)

Steps to replicate

• Run Gutenberg master with seedlet blocks theme.
• In the editor select a post and look to customize the Line Height.
• Verify this option is no longer available.

Recent changes in Gutenberg have made the block level custom line hight options require a theme level opt-in. That is, the "Line Height" option we used to have for blocks such as Paragraph:

Is no longer present on Gutenberg master while using Seedlet Blocks. For this to be available again, we will need to add add_theme_support( 'custom-line-height' ) to the theme (WordPress/gutenberg#23044 (comment)).

[kjellr]

Thanks for the heads up!