[webkit-dev] selecting text ignores mouse down position

[Evan Martin]

For those following at home, this moved to
https://bugs.webkit.org/show_bug.cgi?id=56213

On Fri, Mar 11, 2011 at 11:39 AM, Ryosuke Niwa <rniwa at webkit.org> wrote:
> I think this is a WebKit bug indeed.  I've been annoyed by this bug quite
> few times and have been trying to figure out the reason.  Thanks for
> spotting the root cause!
> - Ryosuke
>
> On Fri, Mar 11, 2011 at 11:34 AM, Evan Martin <evan at chromium.org> wrote:
>>
>> The simple layout test below demonstrates that when you select text by
>> clicking and dragging, we ignore the position of the initial mouse
>> down and instead rely on mouse move events to judge what text is
>> selected.  I verified the behavior on Linux (Chrome) and Mac
>> (non-Chrome).
>>
>> Is it expected that the platform sends a mouse move event at the
>> position of the initial mouse down when dragging?
>> Or is this a bug in WebKit?  I'm trying to figure out which layer I
>> should fix this at.
>>
>> I manually verified on Chrome Linux via some logging statements that
>> if I move the mouse rapidly and drag, the mouse down position is
>> sometimes a pixel away from the first mouse move event position.
>>
>> <div id='text'>The first part of this text should be selected.</div>
>> <script>
>> if (window.eventSender) {
>>    var div = document.getElementById('text');
>>    var x = div.offsetLeft + 1;
>>    var y = div.offsetTop + 5;
>>    eventSender.mouseMoveTo(x, y);
>>    eventSender.mouseDown();
>>
>>    // With this mouse move event, we select the initial range of text.
>>    // Without it, we don't -- we just get the caret positioned within the
>> text.
>>    eventSender.mouseMoveTo(x, y);
>>
>>    eventSender.mouseMoveTo(x + 50, y);
>>    eventSender.mouseUp();
>> }
>> </script>
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>
>