findFileByName failing in 0.8.2 beta (was working in 0.8.1 beta)

[obbimi]

When creating the simply groovy plugin with the following code, it works with version 0.8.1 beta.
But since upgrading to 0.8.2 beta, it fails with some class cast exception.

String anExistingFileName = "build.java.xml"
try {
    Object someFile = findFileByName(anExistingFileName, project)
    show("Found existing file : " + someFile)
} catch(Exception e) {
    show("findFileByName failed")
    throw e
}

try {
    Object someFiles = findAllFilesByName(anExistingFileName, project)
    show("Found existing files : " + someFiles)
} catch(Exception e) {
    show("findAllFilesByName failed")
    throw e
}

Example of the stacktrace

org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'file://C:/code/tim.git/ant/build.java.xml' with class 'com.intellij.openapi.vfs.newvfs.impl.VirtualFileImpl' to class 'com.intellij.psi.PsiFile'
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:408)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319)
	at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:243)
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:615)
	at liveplugin.implementation.FileSearch.findFileByName(FileSearch.groovy:21)
	at liveplugin.implementation.FileSearch$findFileByName.call(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:47)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:157)
	at liveplugin.PluginUtil.findFileByName(PluginUtil.groovy:718)
	at liveplugin.PluginUtil.findFileByName(PluginUtil.groovy)
	at liveplugin.PluginUtil$findFileByName.callStatic(Unknown Source)
	at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:55)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:217)
	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:240)
	at plugin.run(plugin.groovy:7)
	at groovy.util.GroovyScriptEngine.run(GroovyScriptEngine.java:566)
	at liveplugin.implementation.pluginrunner.groovy.GroovyPluginRunner.run(GroovyPluginRunner.kt:77)
	at liveplugin.implementation.pluginrunner.PluginRunnerKt$runWith$1$1$1.invoke(PluginRunner.kt:162)
	at liveplugin.implementation.pluginrunner.PluginRunnerKt$runWith$1$1$1.invoke(PluginRunner.kt:162)
	at liveplugin.implementation.common.IdeUtil.runOnEdt$lambda-1(ide-util.kt:88)
	at com.intellij.openapi.application.TransactionGuardImpl.runWithWritingAllowed(TransactionGuardImpl.java:209)
	at com.intellij.openapi.application.TransactionGuardImpl.access$100(TransactionGuardImpl.java:21)
	at com.intellij.openapi.application.TransactionGuardImpl$1.run(TransactionGuardImpl.java:191)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.openapi.application.impl.ApplicationImpl$3.run(ApplicationImpl.java:513)
	at com.intellij.openapi.application.impl.LaterInvocator$1.run(LaterInvocator.java:95)
	at com.intellij.openapi.application.impl.FlushQueue.doRun(FlushQueue.java:75)
	at com.intellij.openapi.application.impl.FlushQueue.runNextEvent(FlushQueue.java:118)
	at com.intellij.openapi.application.impl.FlushQueue.flushNow(FlushQueue.java:42)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:779)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:730)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:724)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:749)
	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:918)
	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:766)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$6(IdeEventQueue.java:450)
	at com.intellij.openapi.progress.impl.CoreProgressManager.computePrioritized(CoreProgressManager.java:791)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$7(IdeEventQueue.java:449)
	at com.intellij.openapi.application.TransactionGuardImpl.performActivity(TransactionGuardImpl.java:105)
	at com.intellij.ide.IdeEventQueue.performActivity(IdeEventQueue.java:624)
	at com.intellij.ide.IdeEventQueue.lambda$dispatchEvent$8(IdeEventQueue.java:447)
	at com.intellij.openapi.application.impl.ApplicationImpl.runIntendedWriteActionOnCurrentThread(ApplicationImpl.java:881)
	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:493)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:207)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:92)

[obbimi]

I think this is the commit that contains the code that is causing the bug
a46fcd5