Refactor script reports: introduce getter, check that report are changed inside attach method

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/IdeScriptReportSink.kt

@@ -23,13 +23,16 @@ import com.intellij.openapi.util.Key
 import com.intellij.openapi.vfs.VirtualFile
 import com.intellij.psi.PsiManager
 import com.intellij.ui.EditorNotifications
+import org.jetbrains.kotlin.psi.UserDataProperty
 import org.jetbrains.kotlin.scripting.resolve.ScriptReportSink
 import kotlin.script.experimental.dependencies.ScriptReport
 
 class IdeScriptReportSink(val project: Project) : ScriptReportSink {
     override fun attachReports(scriptFile: VirtualFile, reports: List<ScriptReport>) {
+        if (getReports(scriptFile) == reports) return
+
         // TODO: persist errors between launches?
-        scriptFile.putUserData(Reports, reports)
+        scriptFile.scriptReports = reports
 
         ApplicationManager.getApplication().invokeLater {
             if (scriptFile.isValid && !project.isDisposed) {
@@ -41,5 +44,11 @@ class IdeScriptReportSink(val project: Project) : ScriptReportSink {
         }
     }
 
-    object Reports : Key<List<ScriptReport>>("KOTLIN_SCRIPT_REPORTS")
+    companion object {
+        fun getReports(file: VirtualFile): List<ScriptReport> {
+            return file.scriptReports ?: emptyList()
+        }
+
+        private var VirtualFile.scriptReports: List<ScriptReport>? by UserDataProperty(Key.create("KOTLIN_SCRIPT_REPORTS"))
+    }
 }

idea/idea-core/src/org/jetbrains/kotlin/idea/core/script/dependencies/ScriptDependenciesLoader.kt

@@ -77,9 +77,7 @@ abstract class ScriptDependenciesLoader(protected val project: Project) {
     }
 
     private fun attachReportsIfChanged(result: ResultWithDiagnostics<*>, file: VirtualFile) {
-        if (file.getUserData(IdeScriptReportSink.Reports) != result.reports.takeIf { it.isNotEmpty() }) {
-            reporter.attachReports(file, result.reports.mapToLegacyReports())
-        }
+        reporter.attachReports(file, result.reports.mapToLegacyReports())
     }
 
     private fun save(compilationConfigurationResult: ScriptCompilationConfigurationResult?, file: VirtualFile) {