I believe #reply-control .user-selector, #reply-control .title-and-category should have align-content: flex-start to avoid this spacing with larger font sizes:
إعجاب واحد (1)
are you on latest? We did lots of changes on various inputs lately.
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Yeah, I’m on 2.8.0.beta6 aba08d1929 and it still shows up. I think it’s because I have the “default text size” setting as “Largest”
إعجاب واحد (1)
I don’t quite see the same issue here on meta with text size set to “Largest”:
(The tags dropdown size still doesn’t match the categories, mind. I’ll fix that next week.)
Note also that in your screenshot, the cog icon in the editor is misaligned, which is something we have fixed in core, but your theme likely needs an update.
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You’re right. It was due to custom CSS. I’ll be more careful next time and test with a default theme before reporting. 
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No worries, @Nacho_Caballero, there was a small misalignment in core anyways, just merged a fix for it. Closing.
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