On the web, double-clicking a word and then dragging to extend the
native selection also turned the page. The first click's deferred
single-click timer fires 250ms later while the second click's button is
still held during the drag, so it posts iframe-single-click and flips
the page. A plain double-click escapes this because its fast second
click updates lastClickTime in time.
Track the mouse-button state in iframeEventHandlers and suppress the
deferred single click while the button is held (a drag is in progress).
A normal single click is unaffected: its button is already released by
the time the deferred timer fires.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Huang Xin
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