[Webkit-unassigned] [Bug 80373] New: Refactoring: Make InsertionPoint code clean.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=80373

           Summary: Refactoring: Make InsertionPoint code clean.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: shinyak at chromium.org
            Blocks: 78596


This bug is preparation for Bug 78596.

InsertionPoint::attach will have code for <shadow> element later, but it is a bit messy now.
So let's clean up the code.

(1) Currently InsertionPoint attaches fallback elements before attaching distributed elements.
To be consistent, attaching distributed elements first is better, since Element attaches shadow tree first.

(2) Let's extract functions from InsertionPoint::attach() also.

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