It was broken previously as well, but I updated today to 1.5.4 and it's still broken. The indicator shows up, but the window doesn't change. Stable and Beta both seem to be on 1.5.4, but I tried both just to be safe.
Drag to Title Bar to Fill Screen broken on 1.5.4
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fixed in v1.5.5
It doesn't respect the gaps settings like it did before it was broken, I'm hoping that's not intentional?