Compositor Files

• Resize handles snap to the canvas, other layers and guides, as moving does.
• Values typed or dragged in the Move bar's X, Y, W, H, Scale and rotation fields apply straight away, with no Apply, as one undo step.
• Clone Stamp and Blur keep a scaled-down layer's full detail, so it stays sharp when scaled back up.
• Layer masks work like Photoshop's: with a selection, Add Layer Mask reveals it (Option-click for the opposite), and Option-clicking a mask thumbnail shows the mask on its own.
• Ungroup Layers (⇧⌘G), also in a folder's right-click menu.
• Tabs can be dragged to reorder, and ones that don't fit gather under a menu.
• Holding Command flips Auto Select either way while it's held.
• A brush that can't paint now says why, and Select All then Inverse deselects.
• Scaled layers show their scale in the Layers panel, and Cancel and Apply only appear when an edit is waiting for them.

Thanks to @cheyras for several of these.