Mouse#move omits button: on mouseMoved, so drags never start

[myabc]

🤖 Filed by an agent on my behalf.

Ferrum::Mouse#move sends the buttons bitmask but not button:, so Chrome never treats a held-button move as a drag gesture. No native drag session starts, and with Input.setInterceptDrags(true) enabled, Input.dragIntercepted never fires — which makes CDP-based HTML5 drag-and-drop impossible to build on top of Ferrum today.

lib/ferrum/mouse.rb:

@page.command("Input.dispatchMouseEvent",
              slowmoable: true,
              type: "mouseMoved",
              x: new_x,
              y: new_y,
              buttons: @buttons)   # no `button:`

Minimal repro, identical apart from that one field:

page.command("Input.setInterceptDrags", enabled: true)
page.on("Input.dragIntercepted") { |params, _i, _t| got.set(params["data"]) }

page.command("Input.dispatchMouseEvent", type: "mousePressed", x: sx, y: sy,
                                         button: "left", buttons: 1, clickCount: 1)
5.times do |i|
  page.command("Input.dispatchMouseEvent", type: "mouseMoved", x: sx, y: sy + ((i + 1) * 6),
                                           button: "left", buttons: 1)
end

with    button: "left"  ->  intercepted: YES  ->  dragstart, dragenter, dragover, drop, dragend
without button: "left"  ->  intercepted: NO   ->  no events at all

The second form is what Mouse#move currently emits after Mouse#down.

Chrome 140, Ferrum 0.18.0.

Sending button alongside buttons whenever a button is held looks sufficient. Happy to open a PR if that is the shape you'd want.