Display `SinceKotlin` everywhere (#2708)

* Introduce `extraOptions`

* Make 'SinceKotlin' option

* Display 'SinceKotlin' everywhere

* Dump API

* Fix CLI bug

* Show custom tags in property brief

* Show custom tags in extension brief

* Show `SinceKotlin` for TypeAlias

* Fix `stdlib.diff`

* Add a test

* Display doc for actual typealias

* Propagate SinceKotlin

* Refactor

* Refactor in `SinceKotlinTransformer`

* Revert "Introduce `extraOptions`"

This reverts commit b83fdf5da31a97e2ae037f46a735d34a2f84d2ec.

* Revert "Make 'SinceKotlin' option"

This reverts commit 69f4641d1776f3a4bcd361919212c2de7fa2364e.

* Introduce `dokka.SinceKotlin` system property instead of extra arg

* Fix API

* Fix tests

* Rename

* Spread on extensions

* Put doc and rename prop

1 files changed, 26 insertions, 6 deletions

diff --git a/plugins/base/src/main/kotlin/transformers/documentables/ActualTypealiasAdder.kt b/plugins/base/src/main/kotlin/transformers/documentables/ActualTypealiasAdder.kt
index 58c601bc..e895db60 100644
--- a/plugins/base/src/main/kotlin/transformers/documentables/ActualTypealiasAdder.kt
+++ b/plugins/base/src/main/kotlin/transformers/documentables/ActualTypealiasAdder.kt
@@ -67,12 +67,32 @@ class ActualTypealiasAdder : DocumentableTransformer {
             if (element.expectPresentInSet != null) {
                 typealiases[element.dri]?.let { ta ->
                     val merged = element.withNewExtras(element.extra + ActualTypealias(ta.underlyingType)).let {
-                        when(it) {
-                            is DClass -> it.copy(sourceSets = element.sourceSets + ta.sourceSets)
-                            is DEnum ->  it.copy(sourceSets = element.sourceSets + ta.sourceSets)
-                            is DInterface -> it.copy(sourceSets = element.sourceSets + ta.sourceSets)
-                            is DObject -> it.copy(sourceSets = element.sourceSets + ta.sourceSets)
-                            is DAnnotation -> it.copy(sourceSets = element.sourceSets + ta.sourceSets)
+                        when (it) {
+                            is DClass -> it.copy(
+                                documentation = element.documentation + ta.documentation,
+                                sourceSets = element.sourceSets + ta.sourceSets
+                            )
+
+                            is DEnum -> it.copy(
+                                documentation = element.documentation + ta.documentation,
+                                sourceSets = element.sourceSets + ta.sourceSets
+                            )
+
+                            is DInterface -> it.copy(
+                                documentation = element.documentation + ta.documentation,
+                                sourceSets = element.sourceSets + ta.sourceSets
+                            )
+
+                            is DObject -> it.copy(
+                                documentation = element.documentation + ta.documentation,
+                                sourceSets = element.sourceSets + ta.sourceSets
+                            )
+
+                            is DAnnotation -> it.copy(
+                                documentation = element.documentation + ta.documentation,
+                                sourceSets = element.sourceSets + ta.sourceSets
+                            )
+
                             else -> throw IllegalStateException("${it::class.qualifiedName} ${it.name} cannot have copy its sourceSets")
                         }
                     }