Add tests for KT-20824, KT-23745, KT-23124, KT-20605, KT-23760

#KT-20824 Fixed
 #KT-23745 Fixed
 #KT-23124 Fixed
 #KT-20605 Fixed
 #KT-23760 Fixed

idea/testData/multiModuleHighlighting/multiplatform/additionalMembersInPlatformInterface/common/common.kt

@@ -0,0 +1,5 @@
+// KT-23745
+expect interface A
+expect interface B
+
+interface Both : A, B

idea/testData/multiModuleHighlighting/multiplatform/additionalMembersInPlatformInterface/js/js.kt

@@ -0,0 +1,10 @@
+actual interface A
+actual interface B {
+    fun z()
+    fun x()
+}
+
+<error descr="[ABSTRACT_MEMBER_NOT_IMPLEMENTED] Class 'Impl' is not abstract and does not implement abstract member public abstract fun x(): Unit defined in Both">class Impl</error> : Both {
+    override fun z() {
+    }
+}

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_common/Decimal.kt

@@ -0,0 +1,4 @@
+// KT-23124
+package com.example
+
+expect class Decimal

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_common/Foo.kt

@@ -0,0 +1,7 @@
+package com.example.bar
+
+import com.example.Decimal
+
+class Foo(
+    val bar: Decimal
+)

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_js/DecimalJs.kt

@@ -0,0 +1,3 @@
+package com.example
+
+actual typealias Decimal = Double

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_js/ExampleJs.kt

@@ -0,0 +1,5 @@
+package com.example
+
+import com.example.bar.Foo
+
+val a = Foo(0.toDouble())

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_jvm_dep(fulljdk)/DecimalJvm.kt

@@ -0,0 +1,5 @@
+package com.example
+
+import java.math.BigDecimal
+
+actual typealias Decimal = BigDecimal

idea/testData/multiModuleHighlighting/multiplatform/platformTypeAliasInterchangebleWithAliasedClass/a_jvm_dep(fulljdk)/ExampleJvm.kt

@@ -0,0 +1,6 @@
+package com.example
+
+import com.example.bar.Foo
+import java.math.BigDecimal
+
+val a = Foo(BigDecimal(1))

idea/testData/multiModuleHighlighting/multiplatform/typeAliasedParameter/common/common.kt

@@ -0,0 +1,10 @@
+// KT-23760
+package foo
+
+expect interface Upper
+
+expect interface BaseI {
+    fun f(p: Upper)
+}
+
+interface I : BaseI

idea/testData/multiModuleHighlighting/multiplatform/typeAliasedParameter/jvm/jvm.kt

@@ -0,0 +1,13 @@
+package foo
+
+interface X
+actual typealias Upper = X
+
+actual interface BaseI {
+    actual fun f(p: Upper)
+}
+
+internal class Impl : I {
+    override fun f(p: Upper) {
+    }
+}

idea/testData/multiModuleHighlighting/multiplatform/useAppendable/a_common_dep(stdlib)/common.kt

@@ -0,0 +1,4 @@
+// KT-20824
+package foo
+
+fun <O : Appendable> O.appendMe(): O = this // kotlin.text.Appendable

idea/testData/multiModuleHighlighting/multiplatform/useAppendable/a_jvm_dep(stdlib)_dep(fulljdk)/jvm.kt

@@ -0,0 +1,7 @@
+package foo
+
+fun tryIt() {
+    buildString {  // kotlin.text.StringBuilder = java.lang.StringBuilder
+        appendMe()
+    }
+}

idea/testData/multiModuleHighlighting/multiplatform/usePlatformSpecificMember/common/common.kt

@@ -0,0 +1,7 @@
+// KT-20605
+package foo
+
+expect class C {
+}
+
+fun getC(): C? = null

idea/testData/multiModuleHighlighting/multiplatform/usePlatformSpecificMember/jvm/jvm.kt

@@ -0,0 +1,15 @@
+package foo
+
+actual class C {
+    fun zzz() {
+    }
+}
+
+fun works() {
+    C().zzz()
+}
+
+fun doesnNot() {
+    getC()?.zzz()
+    getC()?.zzz()
+}