RFR 7902706: IntelliJ jtreg plugin crashes because of removal of deprecated icon

[Jonathan Gibbons]

I'm not an expert on this code, but the changes look reasonable to me.

Given that this code has been in use for a while, you can consider this 
as an approval.

-- Jon

On 6/18/20 3:07 AM, Maurizio Cimadamore wrote:
> Hi,
> this is a path that fixes the crash in the intellij jtreg plugin which 
> started to occur in the latest version 2020.1.
>
> http://cr.openjdk.java.net/~mcimadamore/7902706/webrev/
>
> This patch is based on some work submitted few weeks ago by John Rhee 
> [1]; I sprinkled the usual reflective goop on top to make sure that 
> the plugin keeps working against old versions too (as the new Target 
> icon is only defined for 2019.x).
>
> I've also added an overload for a method whose implementation is 
> deprecated, namely ConfigurationFactory::getId; this should keep 
> things from breaking in the medium run.
>
> As a general note, I see that the IDE is giving quite a bit of warning 
> around the plugin code - in many instances IntelliJ is trying to move 
> towards a lazier/more declarative way to register listener to events 
> [2]. But I think a point will come in which we won't be able to evolve 
> the plugin in a compatible way - so at some point in the future we 
> should probably start thinking about dropping support for older 
> version and start using 2019 as base.
>
> Cheers
> Maurizio
>
>
> [1] - 
> https://mail.openjdk.java.net/pipermail/jtreg-dev/2020-May/000826.html
> [2] - 
> https://www.jetbrains.org/intellij/sdk/docs/basics/plugin_structure/plugin_listeners.html
>