Make Debuggee.threads non-observable

Thread events are already issued via the VMEventBus.

Author: fwcd

adapter/src/main/kotlin/org/javacs/ktda/core/Debuggee.kt

@@ -1,13 +1,12 @@
 package org.javacs.ktda.core
 
 import org.javacs.ktda.core.event.DebuggeeEventBus
-import org.javacs.ktda.util.ObservableList
 import java.io.InputStream
 import java.io.OutputStream
 
 /** A debuggee that is launched upon construction */
 interface Debuggee {
-	val threads: ObservableList<DebuggeeThread>
+	val threads: List<DebuggeeThread>
 	val eventBus: DebuggeeEventBus
 	val stdin: OutputStream?
 		get() = null

adapter/src/main/kotlin/org/javacs/ktda/jdi/JDIDebuggee.kt

@@ -33,7 +33,7 @@ class JDIDebuggee(
 	private val sourcesRoots: Set<Path>,
 	private val context: DebugContext
 ) : Debuggee, JDISessionContext {
-	override val threads = ObservableList<DebuggeeThread>()
+	override var threads = emptyList<DebuggeeThread>()
 	override val eventBus: VMEventBus
 	override val pendingStepRequestThreadIds = mutableSetOf<Long>()
 	override val stdin: OutputStream?
@@ -55,7 +55,9 @@ class JDIDebuggee(
 		hookBreakpoints()
 	}
 
-	override fun updateThreads() = threads.setAll(vm.allThreads().map { JDIThread(it, this) })
+	override fun updateThreads() {
+		threads = vm.allThreads().map { JDIThread(it, this) }
+	}
 
 	private fun hookBreakpoints() {
 		context.breakpointManager.also { manager ->