https://bugs.webkit.org/show_bug.cgi?id=38372

Reviewed by Darin Adler.

WebCore:

* manual-tests/onfocus-alert-blinking-caret.html: Added.

* page/EventHandler.cpp:
(WebCore::EventHandler::handleMousePressEvent):
Moved the call to setCaretBlinkingSuspended() from here...
(WebCore::EventHandler::handleMousePressEvent):
... to here. This makes us suspend caret blinking before dispatching the
mouse down event. If dispatching the mouse down event allows the message
loop to run, we want mouse up events received in that message loop to be
able to resume caret blinking.
(WebCore::EventHandler::lostMouseCapture):
We've lost mouse capture and won't be notified of mouse up events;
resume caret blinking.

* page/EventHandler.h:
Declare lostMouseCapture().

WebKit/win:

* WebView.cpp:
(WebView::handleMouseEvent):
If the message is WM_CANCELMODE, which indicates that we our capturing
of mouse events has been cancelled, tell the EventHandler.
It's possible to re-enter this function if handling a mouse event allows
the message loop to run; moved up the call to setMouseActivated(), so
that if we do re-enter this function, the later mouse event will not be
considered as activating the window.
(WebView::WebViewWndProc):
Handle WM_CANCELMODE by calling handleMouseEvent().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@58625 268f45cc-cd09-0410-ab3c-d52691b4dbfc