[Webkit-unassigned] [Bug 158513] New: Web Inspector: DOMTreeOutline selection areas should be created and updated lazily

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158513

            Bug ID: 158513
           Summary: Web Inspector: DOMTreeOutline selection areas should
                    be created and updated lazily
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com
            Blocks: 156250

In ToT, we

1) create a selection area that covers possibly multiple lines of a DOMTreeOutline
2) delete, recreate, and update the selection area's height whenever an attribute is updated (causes a forced layout)
3) update the selection area whenever expanding, collapsing, attaching, detaching, hovering, or selecting a DOM tree element

These things are bad. We should only make selection areas if needed to provide a multiline hover effect or current selection.

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