KT-22815: Render annotations on separate lines

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRenderer.kt

@@ -192,6 +192,7 @@ interface DescriptorRendererOptions {
     var excludedAnnotationClasses: Set<FqName>
     var excludedTypeAnnotationClasses: Set<FqName>
     var annotationFilter: ((AnnotationDescriptor) -> Boolean)?
+    var eachAnnotationOnNewLine: Boolean
 
     var annotationArgumentsRenderingPolicy: AnnotationArgumentsRenderingPolicy
     val includeAnnotationArguments: Boolean get() = annotationArgumentsRenderingPolicy.includeAnnotationArguments

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -403,7 +403,12 @@ internal class DescriptorRendererImpl(
         val annotationFilter = annotationFilter
         for ((annotation, target) in annotated.annotations.getAllAnnotations()) {
             if (annotation.fqName !in excluded && (annotationFilter == null || annotationFilter(annotation))) {
-                append(renderAnnotation(annotation, target)).append(" ")
+                append(renderAnnotation(annotation, target))
+                if (eachAnnotationOnNewLine) {
+                    appendln()
+                } else {
+                    append(" ")
+                }
             }
         }
     }

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererOptionsImpl.kt

@@ -96,6 +96,8 @@ internal class DescriptorRendererOptionsImpl : DescriptorRendererOptions {
     override var renderAccessors by property(false)
     override var renderDefaultAnnotationArguments by property(false)
 
+    override var eachAnnotationOnNewLine: Boolean by property(false)
+
     override var excludedAnnotationClasses by property(emptySet<FqName>())
 
     override var excludedTypeAnnotationClasses by property(ExcludedTypeAnnotations.internalAnnotationsForResolve)

idea/src/org/jetbrains/kotlin/idea/KotlinQuickDocumentationProvider.kt

@@ -48,6 +48,7 @@ import org.jetbrains.kotlin.kdoc.psi.api.KDoc
 import org.jetbrains.kotlin.kdoc.psi.impl.KDocSection
 import org.jetbrains.kotlin.psi.*
 import org.jetbrains.kotlin.psi.psiUtil.*
+import org.jetbrains.kotlin.renderer.AnnotationArgumentsRenderingPolicy
 import org.jetbrains.kotlin.renderer.ClassifierNamePolicy
 import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.resolve.BindingContext
@@ -165,8 +166,10 @@ class KotlinQuickDocumentationProvider : AbstractDocumentationProvider() {
         private val DESCRIPTOR_RENDERER = DescriptorRenderer.HTML.withOptions {
             classifierNamePolicy = HtmlClassifierNamePolicy(ClassifierNamePolicy.SHORT)
             valueParametersHandler = WrapValueParameterHandler(valueParametersHandler)
+            annotationArgumentsRenderingPolicy = AnnotationArgumentsRenderingPolicy.UNLESS_EMPTY
             renderCompanionObjectName = true
             withDefinedIn = false
+            eachAnnotationOnNewLine = true
         }
 
         private fun renderEnumSpecialFunction(element: KtClass, functionDescriptor: FunctionDescriptor, quickNavigation: Boolean): String {