RFR(JDK 13/java.xml) 8180901: Transformer.reset() resets the state only once

[Lance Andersen]

Hi Joe,

The change seems reasonable...
> On Feb 5, 2019, at 1:37 PM, Joe Wang <huizhe.wang at oracle.com> wrote:
> 
> Please review a quick fix for preserving the initial state of the Transformer. The faulty impl passes a reference of the initial property setting to the working copy during reset, thus causes it to be altered by an user setting. Further reset would then no longer be able to return to the initial state.
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8180901
> webrevs: http://cr.openjdk.java.net/~joehw/jdk13/8180901/webrev/
> 
> Thanks,
> Joe

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 <http://oracle.com/us/design/oracle-email-sig-198324.gif>Lance Andersen| Principal Member of Technical Staff | +1.781.442.2037
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