kashms

// Function to revert from a stack
function revertFromStack(stack: Revertible[]): void {
    const revertible = stack.pop();
    if (revertible !== undefined) {
        revertible.revert();
    }
} 

kashms

// Subscribe to the commitApplied event
treeView.events.on( 
    "commitApplied", 
    (commit: CommitMetadata, getRevertible?: RevertibleFactory): void => { 
        if (getRevertible === undefined) { 
            return;
        }
        const revertible = getRevertible(); 
        if (commit.kind === CommitKind.Undo) { 
            redoStack.push(revertible); 

kashms

public deleteGroup() {
    const parent = Tree.parent(this);
    if (Tree.is(parent, Items)) {
        // Wrap these operations as a transaction
        Tree.runTransaction(parent, () => {
            // Move the children of the group to the parent
            const index = parent.indexOf(this);
            parent.moveRangeToIndex(index, 0, this.items.length, this.items);
            
            // Remove the now empty group

kashms

 {
        "todo": [
                { "id": 1, "text": "buy milk" },
-               { "id": 2, "text": "feed cat" },
+               { "id": 2, "text": "feed Loki" },
                { "id": 3, "text": "buy eggs" }
        ]
 }

kashms

{ 
        "todo": [ 
                { "id": 1, "text": "buy milk" }, 
-               { "id": 2, "text": "feed cat" }, 
-               { "id": 3, "text": "buy eggs" } 
+               { "id": 3, "text": "buy eggs" }, 
+               { "id": 2, "text": "feed cat" } 
        ] 
} 

kashms

{ 
 	"todo": [ 
		{ "id": 1, "text": "buy milk" }, 
		{ "id": 3, "text": "buy eggs" },
		{ "id": 2, "text": "feed Loki" } 
	]
} 

kashms

{ 
	"todo": [ 
		{ "id": 1, "text": "buy milk" }, 
		{ "id": 2, "text": "feed Loki" }, 
		{ "id": 3, "text": "buy eggs" } 
	] 
} 

kashms

{ 
	"todo": [ 
		{ "id": 1, "text": "buy milk" }, 
		{ "id": 3, "text": "buy eggs" }, 
		{ "id": 2, "text": "feed cat" } 
	] 
} 

kashms

{ 
	"todo": [ 
		{ "id": 1, "text": "buy milk" }, 
		{ "id": 2, "text": "feed cat" }, 
		{ "id": 3, "text": "buy eggs" } 
	] 
}