Keyboard menu/widget navigation (#628)

* Keyboard menu navigation

* Fix dropdown keyboard navigation

* Fix merge error

* Some code review

* Interactive dropdowns

* Query by data attr not class name

* Add locking behaviour

* Change query selector style

* Change query selector style (again)

* Code review feedback

* Fix highlighted entry regression

* Styling and disabling checkbox tabindex in MenuLists

* Don't redirect space off canvas to backend

* Do not emit update if value same

* Escape closes all floating menus

* Close dropdowns on blur

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/document/document_message_handler.rs

@@ -780,6 +780,7 @@ impl DocumentMessageHandler {
 					selected_index: blend_mode.map(|blend_mode| blend_mode as u32),
 					disabled: blend_mode.is_none() && !blend_mode_is_mixed,
 					draw_icon: false,
+					..Default::default()
 				})),
 				WidgetHolder::new(Widget::Separator(Separator {
 					separator_type: SeparatorType::Related,

editor/src/layout/widgets.rs

@@ -359,8 +359,8 @@ pub struct PopoverButton {
 	pub text: String,
 }
 
-#[derive(Clone, Serialize, Deserialize, Derivative, Default)]
-#[derivative(Debug, PartialEq)]
+#[derive(Clone, Serialize, Deserialize, Derivative)]
+#[derivative(Debug, PartialEq, Default)]
 pub struct DropdownInput {
 	pub entries: Vec<Vec<DropdownEntryData>>,
 	// This uses `u32` instead of `usize` since it will be serialized as a normal JS number (replace with usize when we switch to a native UI)
@@ -368,6 +368,8 @@ pub struct DropdownInput {
 	pub selected_index: Option<u32>,
 	#[serde(rename = "drawIcon")]
 	pub draw_icon: bool,
+	#[derivative(Default(value = "true"))]
+	pub interactive: bool,
 	// `on_update` exists on the `DropdownEntryData`, not this parent `DropdownInput`
 	pub disabled: bool,
 }