[Webkit-unassigned] [Bug 165056] New: [GTK] Overlay scrolling with iframe-s broken

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165056

            Bug ID: 165056
           Summary: [GTK] Overlay scrolling with iframe-s broken
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcrha at redhat.com

Moving this from a downstream bug report:
https://bugzilla.redhat.com/show_bug.cgi?id=1395942

When gtk+ has set overlay scrollbars and the page contains at least one iframe, then the scrolling using the scrollbars with mouse left-click doesn't always work.

Observations:
a) mouse wheel works fine (when hovering mouse above the scroll bar)
b) when the vertical scrollbar is at the very bottom, then it works too
c) when I disable overlay scrollbars [1], then it works no matter what

[1] run the application as:
    $ GTK_OVERLAY_SCROLLING=0 test-wk2

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