Support for deleting points to break path (#1593)

* feat: break closed curve

* feat: update hotkeys and handles

* feat: break an open path

* feat: elegantly handle breaking at multi points in a subpath

* feat: handle break at end points

* feat: ctrl+delete to remove segments and break path

* fix: rm unused

* First code review pass

* fix: closed eclipse handles after breaking path

---------

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

editor/src/messages/tool/tool_messages/path_tool.rs

@@ -32,7 +32,9 @@ pub enum PathToolMessage {
 	SelectionChanged,
 
 	// Tool-specific messages
+	BreakPath,
 	Delete,
+	DeleteAndBreakPath,
 	DragStart {
 		add_to_selection: Key,
 	},
@@ -159,6 +161,8 @@ impl<'a> MessageHandler<ToolMessage, &mut ToolActionHandlerData<'a>> for PathToo
 				NudgeSelectedPoints,
 				Enter,
 				SelectAllPoints,
+				BreakPath,
+				DeleteAndBreakPath,
 			),
 			Dragging => actions!(PathToolMessageDiscriminant;
 				InsertPoint,
@@ -166,6 +170,8 @@ impl<'a> MessageHandler<ToolMessage, &mut ToolActionHandlerData<'a>> for PathToo
 				PointerMove,
 				Delete,
 				SelectAllPoints,
+				BreakPath,
+				DeleteAndBreakPath,
 			),
 			DrawingBox => actions!(PathToolMessageDiscriminant;
 				InsertPoint,
@@ -174,6 +180,8 @@ impl<'a> MessageHandler<ToolMessage, &mut ToolActionHandlerData<'a>> for PathToo
 				Delete,
 				Enter,
 				SelectAllPoints,
+				BreakPath,
+				DeleteAndBreakPath,
 			),
 		}
 	}
@@ -418,6 +426,14 @@ impl Fsm for PathToolFsmState {
 
 				PathToolFsmState::Ready
 			}
+			(_, PathToolMessage::BreakPath) => {
+				shape_editor.break_path_at_selected_point(&document.network, responses);
+				PathToolFsmState::Ready
+			}
+			(_, PathToolMessage::DeleteAndBreakPath) => {
+				shape_editor.delete_point_and_break_path(&document.network, responses);
+				PathToolFsmState::Ready
+			}
 			(_, PathToolMessage::InsertPoint) => {
 				// First we try and flip the sharpness (if they have clicked on an anchor)
 				if !shape_editor.flip_sharp(&document.network, &document.metadata, input.mouse.position, SELECTION_TOLERANCE, responses) {