misleading Next button in Contextual Alternates lookup dialog

[sosasees]

issue

yesterday i learned how to add contextual alternates to my font.
the thing that tripped me up the most was a disabled Next button in the "contextual alternates" Lookup dialog:

i spent hours wondering how to unlock this Next button, only to eventually realise it's never meant to unlock.

this confusion caused me to complete adding my first contextual alternate at 22:00 instead of at 20:00 or maybe even at 18:00. please make this always‐disabled button invisible so it won't confuse others like it confused me.

my computer

• OS: Debian v12.5
• X11
• FontForge version: 20230101

how to reproduce

the Contextual Alternates dialog is seen when creating a Contextual Alternates lookup under
"Element" menu → Font Info → Lookups → "GSUB" tab

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