The none smooth stroke applied to an SVG shape breaks its hit testing

The none smooth stroke applied to an SVG shape breaks its hit testing
https://bugs.webkit.org/show_bug.cgi?id=175506

Patch by Said Abou-Hallawa <sabouhallawa@apple.com> on 2017-08-14
Reviewed by Simon Fraser.

Source/WebCore:

Clear RenderSVGShape::m_path when calling RenderSVGRect::updateShapeFromElement().
The m_path will be recalculated when RenderSVGShape::updateShapeFromElement()
is called from RenderSVGRect::shapeDependentStrokeContains().

Test: svg/stroke/stroke-linejoin-click.html

* rendering/svg/RenderSVGRect.cpp:
(WebCore::RenderSVGRect::updateShapeFromElement):
* rendering/svg/RenderSVGShape.h:
(WebCore::RenderSVGShape::clearPath):

LayoutTests:

* svg/stroke/stroke-linejoin-click-expected.html: Added.
* svg/stroke/stroke-linejoin-click.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220717 268f45cc-cd09-0410-ab3c-d52691b4dbfc