[Webkit-unassigned] [Bug 233767] New: AX: In AccessibilityRenderObject::documentLinks, use existing image-map document links instead of always creating new ones

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233767

            Bug ID: 233767
           Summary: AX: In AccessibilityRenderObject::documentLinks, use
                    existing image-map document links instead of always
                    creating new ones
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

The current implementation of AccessibilityRenderObject::documentLinks always creates new image-map links rather than using the existing ones created via AccessibilityRenderObject::addImageMapChildren. This is problematic for two reasons:

  1. It is wasteful in terms of memory usage as we will endlessly accumulate AccessibilityImageMapLink objects in the cache each time AccessibilityRenderObject::documentLinks is called.
  2. It breaks document links in isolated tree mode, since the objects created this way aren't a child of any other object, and thus don't have any representation in the isolated tree. Concretely, this means AXIsolatedTree::nodeForID never returns anything for these objects.

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