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Plugin does not use configured dot.exe

See original GitHub issue

On our work laptops, we cannot run any application under our home folder. The administrators restricted permissions to only run programs under specific directories which they control.

It seems however that PlantUML now tries to use its embedded dot.exe instead of the one configured in the plugin settings:

java.io.IOException: Cannot run program "C:\Users\xxxxxx\AppData\Local\Temp\_graphviz\dot.exe": CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071) 
	at java.base/java.lang.Runtime.exec(Runtime.java:592) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.startThreads(ProcessRunner.java:163) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.runJob(ProcessRunner.java:123) 
	at net.sourceforge.plantuml.api.TimeoutExecutor$MyThread.run(TimeoutExecutor.java:79) 
Caused by: java.io.IOException: CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessImpl.create(Native Method) 
	at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:478) 
	at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:154) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1107) 
	... 5 more 
java.io.IOException: Cannot run program "C:\Users\xxxxxx\AppData\Local\Temp\_graphviz\dot.exe": CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071) 
	at java.base/java.lang.Runtime.exec(Runtime.java:592) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.startThreads(ProcessRunner.java:163) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.runJob(ProcessRunner.java:123) 
	at net.sourceforge.plantuml.api.TimeoutExecutor$MyThread.run(TimeoutExecutor.java:79) 
Caused by: java.io.IOException: CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessImpl.create(Native Method) 
	at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:478) 
	at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:154) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1107) 
	... 5 more 
java.lang.IllegalStateException: Timeout4 IO_EXCEPTION1 java.io.IOException: Cannot run program "C:\Users\xxxxxx\AppData\Local\Temp\_graphviz\dot.exe": CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at net.sourceforge.plantuml.svek.DotStringFactory.getSvg(DotStringFactory.java:309) 
	at net.sourceforge.plantuml.svek.GeneralImageBuilder.buildImage(GeneralImageBuilder.java:463) 
	at net.sourceforge.plantuml.svek.GroupPngMakerState.getImage(GroupPngMakerState.java:165) 
	at net.sourceforge.plantuml.cucadiagram.dot.CucaDiagramSimplifierState.computeImage(CucaDiagramSimplifierState.java:116) 
	at net.sourceforge.plantuml.cucadiagram.dot.CucaDiagramSimplifierState.<init>(CucaDiagramSimplifierState.java:68) 
	at net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFileInternal(CucaDiagramFileMakerSvek.java:103) 
	at net.sourceforge.plantuml.svek.CucaDiagramFileMakerSvek.createFile(CucaDiagramFileMakerSvek.java:79) 
	at net.sourceforge.plantuml.cucadiagram.CucaDiagram.exportDiagramInternal(CucaDiagram.java:655) 
	at net.sourceforge.plantuml.UmlDiagram.exportDiagramNow(UmlDiagram.java:176) 
	at net.sourceforge.plantuml.AbstractPSystem.exportDiagram(AbstractPSystem.java:140) 
	at net.sourceforge.plantuml.SourceStringReader.outputImage(SourceStringReader.java:160) 
	at org.plantuml.idea.rendering.PlantUmlNormalRenderer.generateImageItem(PlantUmlNormalRenderer.java:211) 
	at org.plantuml.idea.rendering.PlantUmlNormalRenderer.normalRendering(PlantUmlNormalRenderer.java:169) 
	at org.plantuml.idea.rendering.PlantUmlNormalRenderer.doRender(PlantUmlNormalRenderer.java:129) 
	at org.plantuml.idea.rendering.PlantUmlRendererUtil.render(PlantUmlRendererUtil.java:73) 
	at org.plantuml.idea.rendering.RenderCommand.run(RenderCommand.java:67) 
	at org.plantuml.idea.rendering.LazyApplicationPoolExecutor$1.run(LazyApplicationPoolExecutor.java:122) 
	at com.intellij.util.RunnableCallable.call(RunnableCallable.java:20) 
	at com.intellij.util.RunnableCallable.call(RunnableCallable.java:11) 
	at com.intellij.openapi.application.impl.ApplicationImpl$1.call(ApplicationImpl.java:270) 
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) 
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) 
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) 
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668) 
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665) 
	at java.base/java.security.AccessController.doPrivileged(Native Method) 
	at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665) 
	at java.base/java.lang.Thread.run(Thread.java:834) 
Caused by: java.io.IOException: Cannot run program "C:\Users\xxxxxx\AppData\Local\Temp\_graphviz\dot.exe": CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071) 
	at java.base/java.lang.Runtime.exec(Runtime.java:592) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.startThreads(ProcessRunner.java:163) 
	at net.sourceforge.plantuml.cucadiagram.dot.ProcessRunner$MainThread.runJob(ProcessRunner.java:123) 
	at net.sourceforge.plantuml.api.TimeoutExecutor$MyThread.run(TimeoutExecutor.java:79) 
Caused by: java.io.IOException: CreateProcess error=1260, This program is blocked by group policy. For more information, contact your system administrator 
	at java.base/java.lang.ProcessImpl.create(Native Method) 
	at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:478) 
	at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:154) 
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1107) 
	... 5 more

I have checked that the dot.exe file is different (different file size).

What I have tried:

Using the GRAPHVIZ_DOT environment variable (and the corresponding checkbox in the plugin settings)
Using backslashes instead of the forward slashes (used by default when browsing to dot.exe in the UI)
Upgrading to the graphviz lite distribution from PlantUML (version 2.44.1)