fix: restore ghost placement cancellation handling

src/lib/litegraph/src/LGraphCanvas.ts

@@ -684,6 +684,7 @@ export class LGraphCanvas implements CustomEventDispatcher<LGraphCanvasEventMap>
   private _visibleReroutes: Set<Reroute> = new Set()
   private _autoPan: AutoPanController | null = null
   private _ghostPointerHandler: ((e: PointerEvent) => void) | null = null
+  private _ghostKeyHandler: ((e: KeyboardEvent) => void) | null = null
 
   dirty_canvas: boolean = true
   dirty_bgcanvas: boolean = true
@@ -1860,6 +1861,8 @@ export class LGraphCanvas implements CustomEventDispatcher<LGraphCanvasEventMap>
     const { graph } = this
     if (newGraph === graph) return
 
+    if (this.state.ghostNodeId != null) this.finalizeGhostPlacement(true)
+
     this.clear()
     newGraph.attachCanvas(this)
 
@@ -3667,6 +3670,8 @@ export class LGraphCanvas implements CustomEventDispatcher<LGraphCanvasEventMap>
    * @param dragEvent Optional mouse event for positioning under cursor
    */
   startGhostPlacement(node: LGraphNode, dragEvent?: MouseEvent): void {
+    if (this.state.ghostNodeId != null) this.finalizeGhostPlacement(true)
+
     this.emitBeforeChange()
     this.graph?.beforeChange()
 
@@ -3706,6 +3711,17 @@ export class LGraphCanvas implements CustomEventDispatcher<LGraphCanvasEventMap>
       'pointerleave',
       this._ghostPointerHandler
     )
+
+    this._ghostKeyHandler = (e: KeyboardEvent) => {
+      if (e.key !== 'Escape' && e.key !== 'Delete' && e.key !== 'Backspace') {
+        return
+      }
+
+      this.finalizeGhostPlacement(true)
+      e.stopPropagation()
+      e.preventDefault()
+    }
+    document.addEventListener('keydown', this._ghostKeyHandler, true)
   }
 
   /**
@@ -3734,6 +3750,11 @@ export class LGraphCanvas implements CustomEventDispatcher<LGraphCanvasEventMap>
       this._ghostPointerHandler = null
     }
 
+    if (this._ghostKeyHandler) {
+      document.removeEventListener('keydown', this._ghostKeyHandler, true)
+      this._ghostKeyHandler = null
+    }
+
     const node = this.graph?.getNodeById(nodeId)
     if (!node) return