Minor: add debug log messages

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/LastModifiedFiles.kt

@@ -36,7 +36,11 @@ class LastModifiedFiles(
     class SimultaneouslyChangedFiles(
         val ts: Long = Long.MIN_VALUE,
         val fileIds: MutableSet<String> = mutableSetOf()
-    )
+    ) {
+        override fun toString(): String {
+            return "SimultaneouslyChangedFiles(ts=$ts, fileIds=$fileIds)"
+        }
+    }
 
     @Synchronized
     fun fileChanged(ts: Long, fileId: String) {
@@ -59,6 +63,10 @@ class LastModifiedFiles(
         else -> last.ts
     }
 
+    override fun toString(): String {
+        return "LastModifiedFiles(last=$last, previous=$previous)"
+    }
+
     companion object {
         private val fileAttribute = FileAttribute("last-modified-files", 1, false)
 

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/importing/KotlinDslScriptModelProcessor.kt

@@ -134,6 +134,10 @@ class KotlinDslGradleBuildSync(val workingDir: String, val taskId: ExternalSyste
     val projectRoots = mutableSetOf<String>()
     val models = mutableListOf<KotlinDslScriptModel>()
     var failed = false
+
+    override fun toString(): String {
+        return "KotlinGradleDslSync(workingDir=$workingDir, gradleVersion=$gradleVersion, gradleHome=$gradleHome, javaHome=$javaHome, projectRoots=$projectRoots, failed=$failed)"
+    }
 }
 
 fun saveScriptModels(project: Project, build: KotlinDslGradleBuildSync) {

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/roots/GradleBuildRoot.kt

@@ -12,6 +12,8 @@ import org.jetbrains.kotlin.idea.core.script.ucache.ScriptClassRootsBuilder
 import org.jetbrains.kotlin.idea.scripting.gradle.GradleScriptDefinitionsContributor
 import org.jetbrains.kotlin.idea.scripting.gradle.LastModifiedFiles
 import org.jetbrains.kotlin.idea.scripting.gradle.importing.KotlinDslScriptModel
+import org.jetbrains.kotlin.idea.scripting.gradle.scriptingDebugLog
+import org.jetbrains.kotlin.idea.scripting.gradle.scriptingErrorLog
 import org.jetbrains.kotlin.scripting.definitions.ScriptDefinition
 import org.jetbrains.kotlin.scripting.resolve.VirtualFileScriptSource
 import org.jetbrains.plugins.gradle.settings.GradleProjectSettings
@@ -43,6 +45,7 @@ sealed class GradleBuildRoot(
         get() = LocalFileSystem.getInstance().findFileByPath(pathPrefix)
 
     fun saveLastModifiedFiles() {
+        scriptingDebugLog { "LasModifiedFiles saved: $lastModifiedFiles" }
         LastModifiedFiles.write(dir ?: return, lastModifiedFiles)
     }
 

idea/idea-gradle/src/org/jetbrains/kotlin/idea/scripting/gradle/roots/GradleBuildRootsManager.kt

@@ -146,6 +146,8 @@ class GradleBuildRootsManager(val project: Project) : GradleBuildRootsLocator(),
             if (oldRoot is Imported && oldRoot.data.models.isEmpty()) return
         }
 
+        scriptingDebugLog { "save gradle project info after import: $sync" }
+
         if (oldRoot is Legacy) {
             oldRoot.importing.set(updated)
             return
@@ -161,6 +163,7 @@ class GradleBuildRootsManager(val project: Project) : GradleBuildRootsLocator(),
                 return
             }
 
+            scriptingDebugLog { "save script models after import: ${sync.models}" }
 
             val newData = GradleBuildRootData(
                 sync.ts, sync.projectRoots, gradleHome, sync.javaHome, sync.models