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Item6939: Use existing image file after "makeChart" subroutine fails to write.

Item Form Data

AppliesTo:	Component:	Priority:	CurrentState:	WaitingFor:	TargetRelease	ReleasedIn
Extension	ChartPlugin	Low	Closed		n/a	5.1.2

Detail

Everytime it renders a chart image, the "makeChart" subroutine always redraw images without checking if the target image files already exists and can be reused. One possible scenario is the target image file already exists but for some reason it becomes read only, "makeChart" will return error after it fails to write image to the target file. This code change is to check and pick up the existing image file after it fails to write.

-- TWiki:Main/YaojunFei - 2012-09-20

ItemTemplate
Summary	Use existing image file after "makeChart" subroutine fails to write.
ReportedBy	TWiki:Main.YaojunFei
Codebase	5.1.1
SVN Range	TWiki-5.1.1-trunk, Wed, 12 Sep 2012, build 23351
AppliesTo	Extension
Component	ChartPlugin
Priority	Low
CurrentState	Closed
WaitingFor
Checkins	TWikirev:23423
TargetRelease	n/a
ReleasedIn	5.1.2