[KSP] FileAlreadyExistsException: Hilt fails during multi-round processing due to recreating files

[isaac-udy]

This was originally reported in isaac-udy/Enro, but I believe that this is an issue with Hilt (not with Enro). The original issue is here: isaac-udy/Enro#192

Problem:
It appears that when Hilt is used with KSP and another KSP processor causes multiple rounds of processing, Hilt will attempt to recreate files such as the Activity/Fragment _GeneratedInjector.java files. This causes a FileAlreadyExistsException for each of the classes that Hilt attempts to recreate, causing the KSP processing build step to fail.

Expected behavior:
When another KSP processor causes multiple rounds of processing, Hilt should not attempt to generate files multiple times.

Example stacktrace:

[ksp] [Hilt] [ksp] [Hilt] ...\example\build\generated\ksp\debug\java\byRounds\2\dev\enro\example\MainActivity_GeneratedInjector.java: kotlin.io.FileAlreadyExistsException: ...\example\build\generated\ksp\debug\java\byRounds\2\dev\enro\example\MainActivity_GeneratedInjector.java
	at com.google.devtools.ksp.processing.impl.CodeGeneratorImpl.createNewFile(CodeGeneratorImpl.kt:116)
	at com.google.devtools.ksp.processing.impl.CodeGeneratorImpl.createNewFile(CodeGeneratorImpl.kt:67)
	at dagger.spi.shaded.androidx.room.compiler.processing.ksp.KspFiler.createNewFile(KspFiler.kt:156)
	at dagger.spi.shaded.androidx.room.compiler.processing.ksp.KspFiler.write(KspFiler.kt:46)
	at dagger.hilt.android.processor.internal.androidentrypoint.InjectorEntryPointGenerator.generate(InjectorEntryPointGenerator.java:69)
	at dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessingStep.processEach(AndroidEntryPointProcessingStep.java:54)
	at dagger.hilt.processor.internal.BaseProcessingStep.process(BaseProcessingStep.java:118)
	at dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessingStep.process(AndroidEntryPointProcessingStep.java:35)
	at dagger.spi.shaded.androidx.room.compiler.processing.CommonProcessorDelegate.processRound(XBasicAnnotationProcessor.kt:130)
	at dagger.spi.shaded.androidx.room.compiler.processing.ksp.KspBasicAnnotationProcessor.process(KspBasicAnnotationProcessor.kt:62)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$8$1.invoke(KotlinSymbolProcessingExtension.kt:305)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension$doAnalysis$8$1.invoke(KotlinSymbolProcessingExtension.kt:303)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.handleException(KotlinSymbolProcessingExtension.kt:409)
	at com.google.devtools.ksp.AbstractKotlinSymbolProcessingExtension.doAnalysis(KotlinSymbolProcessingExtension.kt:303)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:112)
	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:88)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:256)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:42)
	at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:115)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:247)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.repeatAnalysisIfNeeded(KotlinToJVMBytecodeCompiler.kt:181)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:87)
	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli$default(KotlinToJVMBytecodeCompiler.kt:47)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:168)
	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:53)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:100)
	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.kt:46)
	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:101)
	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:1497)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
	at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:712)
	at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
	at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:833)