Add Litegraph multi-select & group nesting (#1416)

* Allow nested groups

Pass all selected items (new litegraph feature) instead of just selected nodes.

* Allow nested groups - context menus

* Update litegraph

* Update litegraph (Select all / Delete selected)

* Add playwright test

* nit

* Update test expectations [skip ci]

---------

Co-authored-by: huchenlei <huchenlei@proton.me>
Co-authored-by: github-actions <github-actions@github.com>

browser_tests/assets/mixed_graph_items.json

@@ -0,0 +1,227 @@
+{
+  "last_node_id": 3,
+  "last_link_id": 0,
+  "nodes": [
+    {
+      "id": 2,
+      "type": "KSampler",
+      "pos": {
+        "0": 420,
+        "1": 130
+      },
+      "size": {
+        "0": 315,
+        "1": 262
+      },
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": null
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [
+        0,
+        "randomize",
+        20,
+        8,
+        "euler",
+        "normal",
+        1
+      ]
+    },
+    {
+      "id": 3,
+      "type": "KSampler",
+      "pos": {
+        "0": 820,
+        "1": 130
+      },
+      "size": {
+        "0": 315,
+        "1": 262
+      },
+      "flags": {},
+      "order": 1,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": null
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [
+        0,
+        "randomize",
+        20,
+        8,
+        "euler",
+        "normal",
+        1
+      ]
+    },
+    {
+      "id": 1,
+      "type": "KSampler",
+      "pos": {
+        "0": 30,
+        "1": 130
+      },
+      "size": {
+        "0": 315,
+        "1": 262
+      },
+      "flags": {},
+      "order": 2,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": null
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [
+        0,
+        "randomize",
+        20,
+        8,
+        "euler",
+        "normal",
+        1
+      ]
+    }
+  ],
+  "links": [],
+  "groups": [
+    {
+      "id": 0,
+      "title": "Group",
+      "bounding": [
+        406.9701232910156,
+        59.079444885253906,
+        335,
+        345.6000061035156
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    },
+    {
+      "id": 3,
+      "title": "Group Parent",
+      "bounding": [
+        796.9703979492188,
+        14.796443939208984,
+        355,
+        399.20001220703125
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    },
+    {
+      "id": 2,
+      "title": "Group Child",
+      "bounding": [
+        806.9703979492188,
+        58.39643096923828,
+        335,
+        345.6000061035156
+      ],
+      "color": "#3f789e",
+      "font_size": 24,
+      "flags": {}
+    }
+  ],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 1,
+      "offset": [
+        0,
+        0
+      ]
+    }
+  },
+  "version": 0.4
+}

browser_tests/interaction.spec.ts

@@ -1,6 +1,16 @@
 import { expect } from '@playwright/test'
 import { comfyPageFixture as test } from './fixtures/ComfyPage'
 
+test.describe('Item Interaction', () => {
+  test('Can select/delete all items', async ({ comfyPage }) => {
+    await comfyPage.loadWorkflow('mixed_graph_items')
+    await comfyPage.canvas.press('Control+a')
+    await expect(comfyPage.canvas).toHaveScreenshot('selected-all.png')
+    await comfyPage.canvas.press('Delete')
+    await expect(comfyPage.canvas).toHaveScreenshot('deleted-all.png')
+  })
+})
+
 test.describe('Node Interaction', () => {
   test('Can enter prompt', async ({ comfyPage }) => {
     const textBox = comfyPage.widgetTextBox
@@ -12,7 +22,7 @@ test.describe('Node Interaction', () => {
   })
 
   test.describe('Node Selection', () => {
-    const multiSelectModifiers = ['Control', 'Shift', 'Meta']
+    const multiSelectModifiers = ['Control', 'Shift', 'Meta'] as const
 
     multiSelectModifiers.forEach((modifier) => {
       test(`Can add multiple nodes to selection using ${modifier}+Click`, async ({