Bug 117860 – REGRESSION(r145788): mouse drag on canvas shouldn't start selection

• Component: Canvas
• Status: RESOLVED FIXED

[Ryosuke Niwa]

Example URL:
http://www.ivank.net/veci/click_test.html

Steps to reproduce the problem:
1. Open the URL
2. Press mouse on the left half of canvas
3. Drag to the right half and release the mouse.
4. Keep pressing, dragging and releasing mouse on the right 
half on canvas.

What is the expected behavior?
Canvas should support mouse events. If you look into console, it should always print
(down, dragging*, up)* // pseudo regular expression

What went wrong?
Instead, after dragging over the middle of canvas, it gets selected and "mouseup" event does not work, it prints only
(down, dragging*)*

[Radar WebKit Bug Importer]

<rdar://problem/14225079>

[Ryosuke Niwa]

Created attachment 205143 [details]
Fixes the bug

[Ryosuke Niwa]

Comment on attachment 205143 [details]
Fixes the bug

I don't know what Chromium/Blink is doing to make mouse up not fire. That problem doesn't exist in WebKit.

However, we should still not select the canvas element.

[Benjamin Poulain]

Comment on attachment 205143 [details]
Fixes the bug

View in context: https://bugs.webkit.org/attachment.cgi?id=205143&action=review

> LayoutTests/fast/events/mosuedrag-on-canvas-should-not-start-selection.html:11
> +description("This tests initiating a mouse drag on a canvas element doesn't start selection."
> +    + "To manually test, drag mouse on the canvas below. WebKit shouldn't select the canvas.")

Missing space between the sentences (or remove the +)

[Ryosuke Niwa]

Committed r151822: <http://trac.webkit.org/changeset/151822>