Crash when receiving pen-tablet input event

[JohnyJohnJohnson]

Editor panicked when reciving a pen Tablet eraser Input Event.
Reproducible and consistant.

panicked at editor/src/messages/input_mapper/utility_types/input_mouse.rs:107:53:
Invalid decoding of MouseKeys

Wp/<@https://editor.graphite.art/assets/index-BPxHMP7l.js:988:1384
w@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:73924
handleJsMessage@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:74072
yp/e<@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:74496
ep/o.wbg.__wbg_call_833bed5770ea2041/<@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:14904
Ke@https://editor.graphite.art/assets/index-BPxHMP7l.js:969:6188
ep/o.wbg.__wbg_call_833bed5770ea2041@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:14874
graphite_wasm.wasm._ZN13graphite_wasm10editor_api12EditorHandle27send_frontend_message_to_js17hb921190d4deab3e4E@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[807]:0x44c00d
graphite_wasm.wasm._ZN4core3ops8function2Fn4call17hce3f3ec565af54aaE@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[19280]:0xe83259
graphite_wasm.wasm._ZN3std9panicking20rust_panic_with_hook17he3dc6abfb01fb415E@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[10755]:0xd5f456
graphite_wasm.wasm._ZN4core9panicking9panic_fmt17h808dbde205a89691E@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[15108]:0xdfddfe
graphite_wasm.wasm._ZN4core6option13expect_failed17hb1784cfc9624364fE@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[12883]:0xdd1ef0
graphite_wasm.wasm._ZN15graphite_editor8messages12input_mapper13utility_types11input_mouse16EditorMouseState29from_keys_and_editor_position17hed9f2b202a6d4531E@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[13273]:0xddb253
graphite_wasm.wasm.editorhandle_onMouseMove@https://editor.graphite.art/assets/graphite_wasm_bg-BjpNRPYb.wasm:wasm-function[6150]:0xbb7f5e
onMouseMove@https://editor.graphite.art/assets/index-BPxHMP7l.js:970:7966
T@https://editor.graphite.art/assets/index-BPxHMP7l.js:977:2969
action@https://editor.graphite.art/assets/index-BPxHMP7l.js:977:727

[0HyperCube]

I guess your "pen Tablet eraser" device sends mouse button inputs that are out of range for the MouseButtons bitflag

Graphite/editor/src/messages/input_mapper/utility_types/input_mouse.rs

Lines 97 to 109 in 4ab75c9

	bitflags! {
	/// Based on <https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/buttons#value>.
	#[derive(Default, Clone, Copy, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
	#[repr(transparent)]
	pub struct MouseKeys: u8 {
	const NONE = 0b0000_0000;
	const LEFT = 0b0000_0001;
	const RIGHT = 0b0000_0010;
	const MIDDLE = 0b0000_0100;
	const BACK = 0b0000_1000;
	const FORWARD = 0b0001_0000;
	}
	}

This seems to be allowed by the spec. I guess we'd just want to ignore these button presses. This could perhaps be achieved with from_bits_truncate instead of from_bits

Graphite/editor/src/messages/input_mapper/utility_types/input_mouse.rs

Line 79 in 4ab75c9

let mouse_keys = MouseKeys::from_bits(keys).expect("Invalid decoding of MouseKeys");