fix(ivy): ng-content tags in re-inserted templates should walk declaration tree (#27783)

This PR assures that content projection works if an <ng-content> tag is
placed inside an <ng-template> in one component and that <ng-template>
is inserted into a different component. It fixes a bug where the
projection instruction code would walk up the insertion tree to find
selector data instead of the declaration tree.

PR Close #27783

packages/core/src/render3/di.ts

@@ -21,7 +21,7 @@ import {AttributeMarker, TContainerNode, TElementContainerNode, TElementNode, TN
 import {DECLARATION_VIEW, HOST_NODE, INJECTOR, LView, TData, TVIEW, TView} from './interfaces/view';
 import {assertNodeOfPossibleTypes} from './node_assert';
 import {getLView, getPreviousOrParentTNode, setTNodeAndViewData} from './state';
-import {getHostTElementNode, getParentInjectorIndex, getParentInjectorView, hasParentInjector, isComponent, isComponentDef, stringify} from './util';
+import {findComponentView, getParentInjectorIndex, getParentInjectorView, hasParentInjector, isComponent, isComponentDef, stringify} from './util';
 
 
 /**
@@ -320,7 +320,8 @@ export function getOrCreateInjectable<T>(
     let previousTView: TView|null = null;
     let injectorIndex = getInjectorIndex(tNode, lView);
     let parentLocation: RelativeInjectorLocation = NO_PARENT_INJECTOR;
-    let hostTElementNode: TNode|null = flags & InjectFlags.Host ? getHostTElementNode(lView) : null;
+    let hostTElementNode: TNode|null =
+        flags & InjectFlags.Host ? findComponentView(lView)[HOST_NODE] : null;
 
     // If we should skip this injector, or if there is no injector on this node, start by searching
     // the parent injector.

packages/core/src/render3/util.ts

@@ -263,28 +263,16 @@ export function addAllToArray(items: any[], arr: any[]) {
  * Given a current view, finds the nearest component's host (LElement).
  *
  * @param lView LView for which we want a host element node
- * @param declarationMode indicates whether DECLARATION_VIEW or PARENT should be used to climb the
- * tree.
  * @returns The host node
  */
-export function findComponentView(lView: LView, declarationMode?: boolean): LView {
+export function findComponentView(lView: LView): LView {
   let rootTNode = lView[HOST_NODE];
 
   while (rootTNode && rootTNode.type === TNodeType.View) {
-    ngDevMode && assertDefined(
-                     lView[declarationMode ? DECLARATION_VIEW : PARENT],
-                     declarationMode ? 'lView.declarationView' : 'lView.parent');
-    lView = lView[declarationMode ? DECLARATION_VIEW : PARENT] !;
+    ngDevMode && assertDefined(lView[DECLARATION_VIEW], 'lView[DECLARATION_VIEW]');
+    lView = lView[DECLARATION_VIEW] !;
     rootTNode = lView[HOST_NODE];
   }
 
   return lView;
 }
-
-/**
- * Return the host TElementNode of the starting LView
- * @param lView the starting LView.
- */
-export function getHostTElementNode(lView: LView): TElementNode|null {
-  return findComponentView(lView, true)[HOST_NODE] as TElementNode;
-}

packages/core/test/bundling/todo/bundle.golden_symbols.json

@@ -689,9 +689,6 @@
   {
     "name": "getHostNative"
   },
-  {
-    "name": "getHostTElementNode"
-  },
   {
     "name": "getInitialClassNameValue"
   },

packages/core/test/render3/content_spec.ts

@@ -8,10 +8,12 @@
 
 import {SelectorFlags} from '@angular/core/src/render3/interfaces/projection';
 
-import {AttributeMarker, detectChanges} from '../../src/render3/index';
+import {AttributeMarker, defineDirective, detectChanges, directiveInject, load, query, queryRefresh, reference, templateRefExtractor} from '../../src/render3/index';
+
 import {bind, container, containerRefreshEnd, containerRefreshStart, element, elementContainerEnd, elementContainerStart, elementEnd, elementProperty, elementStart, embeddedViewEnd, embeddedViewStart, projection, projectionDef, template, text, textBinding, interpolation1} from '../../src/render3/instructions';
 import {RenderFlags} from '../../src/render3/interfaces/definition';
 
+import {TemplateRef, ViewContainerRef, QueryList} from '@angular/core';
 import {NgIf, NgForOf} from './common_with_def';
 import {ComponentFixture, createComponent, getDirectiveOnNode, renderComponent, toHtml} from './render_util';
 
@@ -997,6 +999,83 @@ describe('content projection', () => {
     expect(fixture.html).toEqual('<child><span>B</span>Before-<div>A</div>-After</child>');
   });
 
+  it('should project if <ng-content> is in a template that has different declaration/insertion points',
+     () => {
+       let triggerDir !: Trigger;
+
+       function NgTemplate(rf: RenderFlags, ctx: any) {
+         if (rf & RenderFlags.Create) {
+           projection(0);
+         }
+       }
+
+       /**
+        * <ng-template>
+        *     <ng-content></ng-content>
+        * </ng-template>
+        */
+       const Comp = createComponent(
+           'comp',
+           (rf: RenderFlags, ctx: any) => {
+             if (rf & RenderFlags.Create) {
+               projectionDef();
+               template(1, NgTemplate, 1, 0, 'ng-template', null, null, templateRefExtractor);
+             }
+           },
+           2, 0, [], [],
+           function(rf: RenderFlags, ctx: any) {
+             /**  @ViewChild(TemplateRef) template: TemplateRef<any>  */
+             if (rf & RenderFlags.Create) {
+               query(0, TemplateRef as any, true);
+             }
+             if (rf & RenderFlags.Update) {
+               let tmp: any;
+               queryRefresh(tmp = load<QueryList<any>>(0)) && (ctx.template = tmp.first);
+             }
+           });
+
+       class Trigger {
+         // @Input()
+         trigger: any;
+
+         constructor(public vcr: ViewContainerRef) {}
+
+         open() { this.vcr.createEmbeddedView(this.trigger.template); }
+
+         static ngComponentDef = defineDirective({
+           type: Trigger,
+           selectors: [['', 'trigger', '']],
+           factory: () => triggerDir = new Trigger(directiveInject(ViewContainerRef as any)),
+           inputs: {trigger: 'trigger'}
+         });
+       }
+
+       /**
+        * <button [trigger]="comp"></button>
+        * <comp #comp>
+        *    Some content
+        * </comp>
+        */
+       const App = createComponent('app', (rf: RenderFlags, ctx: any) => {
+         if (rf & RenderFlags.Create) {
+           element(0, 'button', [AttributeMarker.SelectOnly, 'trigger']);
+           elementStart(1, 'comp', null, ['comp', '']);
+           { text(3, 'Some content'); }
+           elementEnd();
+         }
+         if (rf & RenderFlags.Update) {
+           const comp = reference(2);
+           elementProperty(0, 'trigger', bind(comp));
+         }
+       }, 4, 1, [Comp, Trigger]);
+
+       const fixture = new ComponentFixture(App);
+       expect(fixture.html).toEqual(`<button></button><comp></comp>`);
+
+       triggerDir.open();
+       expect(fixture.html).toEqual(`<button></button>Some content<comp></comp>`);
+     });
+
   it('should project nodes into the last ng-content', () => {
     /**
      * <div><ng-content></ng-content></div>