[Webkit-unassigned] [Bug 176096] New: Unpredictable selection when dragging our of float elements children of an in-flow block-level box

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176096

            Bug ID: 176096
           Summary: Unpredictable selection when dragging our of float
                    elements children of an in-flow block-level box
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfernandez at igalia.com
                CC: wenson_hsieh at apple.com

Created attachment 319356

  --> https://bugs.webkit.org/attachment.cgi?id=319356&action=review

Test case to reproduce the bug

This bug is the first one of several issues we have with selection and out-of-flow elements. 

Attached a reduced case to reproduce the issue. Selecting from any point inside the float element and dragging outside its visible area will cause the selection to change it's visible boundaries, in a very weird and unpredictable way. 

This particular issue address the case of float elements children of an in-flow block-level box. In this scenario, we use the LayoutBlock hit testing logic to determine the position of the selection point. Since we exclude float elements from the valid candidates, we end up setting the parent node. This logic implies that original start/end selection points will be transposed.

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