Tidy the ported drag block, and format fill.rs as master left it

ui/dr-ui/src/collections_ui/drag.rs

@@ -177,16 +177,6 @@ pub(super) fn forget_drag_image_file() {
     }
 }
 
-/// Draw one thumbnail into the composite, scaled to `tw`×`th` at `dx`,`dy`.
-///
-/// Nearest-neighbour: this is a transient 160px cursor bitmap, and a filtered
-/// resample would cost more than it could visibly buy. `dim` darkens the layers
-/// beneath the top one so the stack reads as depth rather than as a smear.
-///
-/// The buffer is premultiplied, so the alpha applied here is baked into the
-/// colour channels as well.
-#[allow(clippy::too_many_arguments)]
-
 /// Draw one thumbnail into the composite, scaled to `tw`×`th` at `dx`,`dy`.
 ///
 /// Nearest-neighbour: this is a transient 160px cursor bitmap, and a filtered