[Webkit-unassigned] [Bug 242550] New: A vertical scrollbar is shown when none is necessary

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242550

            Bug ID: 242550
           Summary: A vertical scrollbar is shown when none is necessary
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 460775

  --> https://bugs.webkit.org/attachment.cgi?id=460775&action=review

Testcase

When the content size matches the view size (or the iframe size), then we'll create a vertical scrollbar and trigger vertical scrolling when it's not necessary (when scrollbars take space, i.e. non-overlay scrollbars).

Turn on always-on scrollbars.
Load the attached testcase
Size the window so that the gray rectangle just covers the web view.
Reload; note how a vertical scrollbar appears.
Now size the window from the bottom, making it slightly taller then shorter, back to the original size. Note how you can make the scrollbar go away.

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