Initial implementation of KT-5955 Completion for override methods

#KT-5955 Fixed

idea/idea-completion/testData/handlers/basic/override/ImplementFunction.kt

@@ -0,0 +1,9 @@
+interface I {
+    fun foo(p: Int)
+}
+
+class A : I {
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override fun foo(p: Int) {...}"

idea/idea-completion/testData/handlers/basic/override/ImplementFunction.kt.after

@@ -0,0 +1,11 @@
+interface I {
+    fun foo(p: Int)
+}
+
+class A : I {
+    override fun foo(p: Int) {
+        <caret><selection>throw UnsupportedOperationException()</selection>
+    }
+}
+
+// ELEMENT_TEXT: "override fun foo(p: Int) {...}"

idea/idea-completion/testData/handlers/basic/override/ImplementVal.kt

@@ -0,0 +1,9 @@
+interface I {
+    val someVal: String?
+}
+
+class A : I {
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override val someVal: String?"

idea/idea-completion/testData/handlers/basic/override/ImplementVal.kt.after

@@ -0,0 +1,10 @@
+interface I {
+    val someVal: String?
+}
+
+class A : I {
+    override val someVal: String?
+        get() = <caret><selection>throw UnsupportedOperationException()</selection>
+}
+
+// ELEMENT_TEXT: "override val someVal: String?"

idea/idea-completion/testData/handlers/basic/override/ImplementVar.kt

@@ -0,0 +1,9 @@
+interface I {
+    var someVar: String
+}
+
+class A : I {
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override var someVar: String"

idea/idea-completion/testData/handlers/basic/override/ImplementVar.kt.after

@@ -0,0 +1,12 @@
+interface I {
+    var someVar: String
+}
+
+class A : I {
+    override var someVar: String
+        get() = <caret><selection>throw UnsupportedOperationException()</selection>
+        set(value) {
+        }
+}
+
+// ELEMENT_TEXT: "override var someVar: String"

idea/idea-completion/testData/handlers/basic/override/KeepAnnotationBefore.kt

@@ -0,0 +1,6 @@
+class A {
+    @Deprecated("")
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/KeepAnnotationBefore.kt.after

@@ -0,0 +1,8 @@
+class A {
+    @Deprecated("")
+    override fun equals(other: Any?): Boolean {
+        <caret><selection>return super.equals(other)</selection>
+    }
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/KeepModifiersBefore.kt

@@ -0,0 +1,6 @@
+class A {
+    @Deprecated("") // it is deprecated
+    public o<caret>
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/KeepModifiersBefore.kt.after

@@ -0,0 +1,8 @@
+class A {
+    @Deprecated("") // it is deprecated
+    public override fun equals(other: Any?): Boolean {
+        <caret><selection>return super.equals(other)</selection>
+    }
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/OverrideFunction.kt

@@ -0,0 +1,5 @@
+class A {
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/OverrideFunction.kt.after

@@ -0,0 +1,7 @@
+class A {
+    override fun equals(other: Any?): Boolean {
+        <caret><selection>return super.equals(other)</selection>
+    }
+}
+
+// ELEMENT_TEXT: "override fun equals(other: Any?): Boolean {...}"

idea/idea-completion/testData/handlers/basic/override/OverrideVar.kt

@@ -0,0 +1,9 @@
+open class B {
+    open var someVar: String = ""
+}
+
+class A : B {
+    o<caret>
+}
+
+// ELEMENT_TEXT: "override var someVar: String"

idea/idea-completion/testData/handlers/basic/override/OverrideVar.kt.after

@@ -0,0 +1,12 @@
+open class B {
+    open var someVar: String = ""
+}
+
+class A : B {
+    override var someVar: String
+        get() = <caret><selection>super.someVar</selection>
+        set(value) {
+        }
+}
+
+// ELEMENT_TEXT: "override var someVar: String"

idea/idea-completion/testData/handlers/basic/override/PublicValInConstructorParameter.kt

@@ -0,0 +1,8 @@
+interface I {
+    val someVal: java.io.File?
+}
+
+class A(public ov<caret>) : I {
+}
+
+// ELEMENT_TEXT: "override val someVal: File?"

idea/idea-completion/testData/handlers/basic/override/PublicValInConstructorParameter.kt.after

@@ -0,0 +1,10 @@
+import java.io.File
+
+interface I {
+    val someVal: java.io.File?
+}
+
+class A(public override val someVal: File?<caret>) : I {
+}
+
+// ELEMENT_TEXT: "override val someVal: File?"

idea/idea-completion/testData/handlers/basic/override/ValInConstructorParameter.kt

@@ -0,0 +1,8 @@
+interface I {
+    val someVal: java.io.File?
+}
+
+class A(ov<caret>) : I {
+}
+
+// ELEMENT_TEXT: "override val someVal: File?"

idea/idea-completion/testData/handlers/basic/override/ValInConstructorParameter.kt.after

@@ -0,0 +1,10 @@
+import java.io.File
+
+interface I {
+    val someVal: java.io.File?
+}
+
+class A(override val someVal: File?<caret>) : I {
+}
+
+// ELEMENT_TEXT: "override val someVal: File?"