fix(ivy): ensure multiple map-based bindings do not skip intermediate values (#32774)

This patch fixes a bug where the map-based cursor moves too far and
skips intermediate values when the correct combination of single-prop
bindings and map-based bindings are used together.

PR Close #32774

packages/core/src/render3/styling/bindings.ts

@@ -152,7 +152,7 @@ function updateBindingData(
     const doSetValuesAsStale = (getConfig(context) & TStylingConfig.HasHostBindings) &&
         !hostBindingsMode && (prop ? !value : true);
     if (doSetValuesAsStale) {
-      renderHostBindingsAsStale(context, data, prop, !prop);
+      renderHostBindingsAsStale(context, data, prop);
     }
   }
   return changed;
@@ -170,28 +170,32 @@ function updateBindingData(
  * binding changes.
  */
 function renderHostBindingsAsStale(
-    context: TStylingContext, data: LStylingData, prop: string | null, isMapBased: boolean): void {
+    context: TStylingContext, data: LStylingData, prop: string | null): void {
   const valuesCount = getValuesCount(context);
 
-  if (hasConfig(context, TStylingConfig.HasPropBindings)) {
+  if (prop !== null && hasConfig(context, TStylingConfig.HasPropBindings)) {
     const itemsPerRow = TStylingContextIndex.BindingsStartOffset + valuesCount;
 
     let i = TStylingContextIndex.ValuesStartPosition;
+    let found = false;
     while (i < context.length) {
       if (getProp(context, i) === prop) {
+        found = true;
         break;
       }
       i += itemsPerRow;
     }
 
-    const bindingsStart = i + TStylingContextIndex.BindingsStartOffset;
+    if (found) {
-    const valuesStart = bindingsStart + 1;  // the first column is template bindings
+      const bindingsStart = i + TStylingContextIndex.BindingsStartOffset;
-    const valuesEnd = bindingsStart + valuesCount - 1;
+      const valuesStart = bindingsStart + 1;  // the first column is template bindings
+      const valuesEnd = bindingsStart + valuesCount - 1;
 
-    for (let i = valuesStart; i < valuesEnd; i++) {
+      for (let i = valuesStart; i < valuesEnd; i++) {
-      const bindingIndex = context[i] as number;
+        const bindingIndex = context[i] as number;
-      if (bindingIndex !== 0) {
+        if (bindingIndex !== 0) {
-        setValue(data, bindingIndex, null);
+          setValue(data, bindingIndex, null);
+        }
       }
     }
   }
@@ -575,9 +579,18 @@ export function applyStylingViaContext(
           // determine whether or not to apply the target property or to skip it
           let mode = mapsMode | (valueApplied ? StylingMapsSyncMode.SkipTargetProp :
                                                 StylingMapsSyncMode.ApplyTargetProp);
+
+          // the first column in the context (when `j == 0`) is special-cased for
+          // template bindings. If and when host bindings are being processed then
+          // the first column will still be iterated over, but the values will only
+          // be checked against (not applied). If and when this happens we need to
+          // notify the map-based syncing code to know not to apply the values it
+          // comes across in the very first map-based binding (which is also located
+          // in column zero).
           if (hostBindingsMode && j === 0) {
             mode |= StylingMapsSyncMode.CheckValuesOnly;
           }
+
           const valueAppliedWithinMap = stylingMapsSyncFn(
               context, renderer, element, bindingData, j, applyStylingFn, sanitizer, mode, prop,
               defaultValue);

packages/core/src/render3/styling/map_based_bindings.ts

@@ -14,7 +14,6 @@ import {getBindingValue, getMapProp, getMapValue, getValue, getValuesCount, isSt
 import {setStylingMapsSyncFn} from './bindings';
 
 
-
 /**
  * --------
  *
@@ -267,19 +266,31 @@ function innerSyncStylingMap(
  *
  * - value is being applied:
  *   if the value is being applied from this current styling
- *   map then there is no need to apply it in a deeper map.
+ *   map then there is no need to apply it in a deeper map
+ *   (i.e. the `SkipTargetProp` flag is set)
  *
  * - value is being not applied:
  *   apply the value if it is found in a deeper map.
+ *   (i.e. the `SkipTargetProp` flag is unset)
  *
  * When these reasons are encountered the flags will for the
  * inner map mode will be configured.
  */
 function resolveInnerMapMode(
-    currentMode: number, valueIsDefined: boolean, isExactMatch: boolean): number {
+    currentMode: number, valueIsDefined: boolean, isTargetPropMatched: boolean): number {
   let innerMode = currentMode;
-  if (!valueIsDefined && !(currentMode & StylingMapsSyncMode.SkipTargetProp) &&
+
-      (isExactMatch || (currentMode & StylingMapsSyncMode.ApplyAllValues))) {
+  // the statements below figures out whether or not an inner styling map
+  // is allowed to apply its value or not. The main thing to keep note
+  // of is that if the target prop isn't matched then its expected that
+  // all values before it are allowed to be applied so long as "apply all values"
+  // is set to true.
+  const applyAllValues = currentMode & StylingMapsSyncMode.ApplyAllValues;
+  const applyTargetProp = currentMode & StylingMapsSyncMode.ApplyTargetProp;
+  const allowInnerApply =
+      !valueIsDefined && (isTargetPropMatched ? applyTargetProp : applyAllValues);
+
+  if (allowInnerApply) {
     // case 1: set the mode to apply the targeted prop value if it
     // ends up being encountered in another map value
     innerMode |= StylingMapsSyncMode.ApplyTargetProp;

packages/core/test/acceptance/styling_spec.ts

@@ -1995,6 +1995,46 @@ describe('styling', () => {
        expect(readyHost).toBeTruthy();
        expect(readyChild).toBeTruthy();
      });
+
+  onlyInIvy('only ivy allows for multiple styles/classes to be balanaced across directives')
+      .it('should allow various duplicate properties to be defined in various styling maps within the template and directive styling bindings',
+          () => {
+            @Component({
+              template: `
+           <div [style.width]="w"
+                [style.height]="h"
+                [style]="s1"
+                [dir-with-styling]="s2">
+         `
+            })
+            class Cmp {
+              h = '100px';
+              w = '100px';
+              s1: any = {border: '10px solid black', width: '200px'};
+              s2: any = {border: '10px solid red', width: '300px'};
+            }
+
+            @Directive({selector: '[dir-with-styling]'})
+            class DirectiveExpectingStyling {
+              @Input('dir-with-styling') @HostBinding('style') public styles: any = null;
+            }
+
+            TestBed.configureTestingModule({declarations: [Cmp, DirectiveExpectingStyling]});
+            const fixture = TestBed.createComponent(Cmp);
+            fixture.detectChanges();
+
+            const element = fixture.nativeElement.querySelector('div');
+            expect(element.style.border).toEqual('10px solid black');
+            expect(element.style.width).toEqual('100px');
+            expect(element.style.height).toEqual('100px');
+
+            fixture.componentInstance.s1 = null;
+            fixture.detectChanges();
+
+            expect(element.style.border).toEqual('10px solid red');
+            expect(element.style.width).toEqual('100px');
+            expect(element.style.height).toEqual('100px');
+          });
 });
 
 function getDebugNode(element: Node): DebugNode|null {