Added fix in getCellFromPoint in create-grid.js for 200% zoom

Author: mattscepter

lib/commons/dom/create-grid.js

@@ -27,6 +27,7 @@ export default function createGrid(
 ) {
   // Prevent multiple calls per run
   if (cache.get('gridCreated') && !parentVNode) {
+    // a11y-engine-domforge change
     if (cache.get('gridSize')) {
       return cache.get('gridSize');
     }
@@ -114,6 +115,7 @@ export default function createGrid(
     node = treeWalker.nextNode();
   }
 
+  // a11y-engine-domforge change
   if (cache.get('gridSize')) {
     return cache.get('gridSize');
   }
@@ -437,6 +439,7 @@ class Grid {
    * @returns {number}
    */
   toGridIndex(num) {
+    // a11y-engine-domforge change
     if (cache.get('gridSize')) {
       return Math.floor(num / cache.get('gridSize'));
     }
@@ -452,10 +455,18 @@ class Grid {
     assert(this.boundaries, 'Grid does not have cells added');
     const rowIndex = this.toGridIndex(y);
     const colIndex = this.toGridIndex(x);
-    assert(
-      isPointInRect({ y: rowIndex, x: colIndex }, this.boundaries),
-      'Element midpoint exceeds the grid bounds'
-    );
+
+    // a11y-engine-domforge change
+    if (cache.get('ruleId') === 'zoom-text-overlap-viewport') {
+      if (!isPointInRect({ y: rowIndex, x: colIndex }, this.boundaries)) {
+        return [];
+      }
+    } else {
+      assert(
+        isPointInRect({ y: rowIndex, x: colIndex }, this.boundaries),
+        'Element midpoint exceeds the grid bounds'
+      );
+    }
     const row = this.cells[rowIndex - this.cells._negativeIndex] ?? [];
     return row[colIndex - row._negativeIndex] ?? [];
   }

lib/commons/dom/get-element-stack.js

@@ -9,6 +9,8 @@ import createGrid from './create-grid';
  * @param {Node} node
  * @return {Node[]}
  */
+
+// Additional props isCoordsPassed, x, y for a11y-engine-domforge
 function getElementStack(node, isCoordsPassed = false, x = null, y = null) {
   createGrid();
 
@@ -19,6 +21,7 @@ function getElementStack(node, isCoordsPassed = false, x = null, y = null) {
     return [];
   }
 
+  // Additional props isCoordsPassed, x, y for a11y-engine-domforge
   return getRectStack(
     grid,
     vNode.boundingClientRect,

lib/commons/dom/get-overflow-hidden-ancestors.js

@@ -18,6 +18,7 @@ const getOverflowHiddenAncestors = memoize(
 
     const overflow = vNode.getComputedStylePropertyValue('overflow');
 
+    // a11y-engine-domforge change
     if (
       cache.get('ruleId') &&
       cache.get('ruleId') === 'zoom-text-overlap-viewport'

lib/commons/dom/get-rect-stack.js

@@ -1,6 +1,7 @@
 import visuallySort from './visually-sort';
 import { getRectCenter } from '../math';
 
+// Additional props isCoordsPassed, x, y for a11y-engine-domforge
 export function getRectStack(
   grid,
   rect,
@@ -15,6 +16,7 @@ export function getRectStack(
   let floorX = Math.floor(center.x);
   let floorY = Math.floor(center.y);
 
+  // a11y-engine-domforge change
   if (isCoordsPassed) {
     floorX = Math.floor(x);
     floorY = Math.floor(y);

lib/commons/dom/get-visible-child-text-rects.js

@@ -31,6 +31,7 @@ const getVisibleChildTextRects = memoize(
       clientRects.push(...filterHiddenRects(contentRects, overflowHiddenNodes));
     });
 
+    // a11y-engine-domforge change
     if (
       clientRects.length <= 0 &&
       cache.get('ruleId') &&