KT-4893 Code completion should not show multiple functions with the same signature

#KT-4893 Fixed

idea/idea-completion/testData/basic/common/shadowing/InInitializer1.kt

@@ -0,0 +1,6 @@
+fun foo(xxx: String) {
+    var xxx = xx<caret>
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "String" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/InInitializer2.kt

@@ -0,0 +1,5 @@
+fun foo() {
+    var xxx = <caret>
+}
+
+// ABSENT: xxx

idea/idea-completion/testData/basic/common/shadowing/InInitializer3.kt

@@ -0,0 +1,8 @@
+fun foo(xxx: Int) {
+    val xxx: Any = run {
+        xx<caret>
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/Locals1.kt

@@ -0,0 +1,15 @@
+class C {
+    val xxx = 1
+
+    fun foo(xxx: String) {
+        val xxx = 'x'
+
+        if (true) {
+            val xxx = true
+            xx<caret>
+        }
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "Boolean" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/Locals2.kt

@@ -0,0 +1,10 @@
+class C {
+    val xxx = 1
+
+    fun foo(xxx: String) {
+        xx<caret>
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "String" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/Overloads.kt

@@ -0,0 +1,17 @@
+package ppp
+
+class C {
+    fun xxx(p: Int) = ""
+
+    fun foo() {
+        xx<caret>
+    }
+}
+
+fun C.xxx(p: Int) = 1
+fun Any.xxx(c: Char) = 1
+fun C.xxx(c: Char) = 1
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(p: Int)", typeText: "String" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(c: Char) for C in ppp", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/OverloadsAndVararg.kt

@@ -0,0 +1,17 @@
+package ppp
+
+class C {
+    fun xxx(vararg s: String, p: Int) = ""
+
+    fun foo() {
+        xx<caret>
+    }
+}
+
+fun C.xxx(vararg s: String, p: Int) = 1
+fun Any.xxx(vararg s: String, c: Char) = 1
+fun C.xxx(vararg s: String, c: Char) = 1
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(vararg s: String, p: Int)", typeText: "String" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(vararg s: String, c: Char) for C in ppp", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/PreferCloserMember.kt

@@ -0,0 +1,14 @@
+class C {
+    inner class Inner {
+        fun foo() {
+            xx<caret>
+        }
+
+        val xxx: String get() = 1
+    }
+
+    val xxx: Int get() = 1
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "String" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/PreferMemberExtension.kt

@@ -0,0 +1,19 @@
+interface I
+
+class C : I {
+    inner class Inner {
+        fun foo() {
+            xx<caret>
+        }
+
+        val Any.xxx: Int get() = 1
+    }
+
+    val I.xxx: Int get() = 1
+
+}
+
+val C.xxx: Int get() = 1
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: " for Any in C.Inner", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/PreferMemberToExtension.kt

@@ -0,0 +1,24 @@
+package ppp
+
+class C {
+    val xxx = ""
+    fun xxx() = ""
+    fun xxx(p: Int) = ""
+
+    fun foo() {
+        xx<caret>
+    }
+}
+
+val C.xxx: Int
+    get() = 1
+
+fun C.xxx() = 1
+fun C.xxx(p: Int) = 1
+fun C.xxx(p: String) = 1
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: null, typeText: "String" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "()", typeText: "String" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(p: Int)", typeText: "String" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "(p: String) for C in ppp", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/PreferMemberToGlobal.kt

@@ -0,0 +1,12 @@
+val xxx: Int get() = 1
+
+class C {
+    fun foo() {
+        xx<caret>
+    }
+
+    val xxx: String get() = 1
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", typeText: "String" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/common/shadowing/PreferMoreSpecificExtension.kt

@@ -0,0 +1,19 @@
+package ppp
+
+interface I
+
+class C : I {
+    fun foo() {
+        xx<caret>
+    }
+}
+
+val Any.xxx: Int get() = 1
+val I.xxx: Int get() = 1
+
+fun Any.xxx() = 1
+fun C.xxx() = 1
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: " for I in ppp", typeText: "Int" }
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "() for C in ppp", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/multifile/PreferMoreSpecificExtension1/PreferMoreSpecificExtension1.dependency.kt

@@ -0,0 +1,4 @@
+package dependency
+
+fun Any.xxx(): Int = 1
+fun ppp.C.xxx(): Int = 1

idea/idea-completion/testData/basic/multifile/PreferMoreSpecificExtension1/PreferMoreSpecificExtension1.kt

@@ -0,0 +1,12 @@
+package ppp
+
+import dependency.*
+
+class C {
+    fun foo() {
+        xx<caret>
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "() for C in dependency", typeText: "Int" }
+// NOTHING_ELSE

idea/idea-completion/testData/basic/multifile/PreferMoreSpecificExtension2/PreferMoreSpecificExtension2.dependency.kt

@@ -0,0 +1,4 @@
+package dependency
+
+fun Any.xxx(): Int = 1
+fun ppp.C.xxx(): Int = 1

idea/idea-completion/testData/basic/multifile/PreferMoreSpecificExtension2/PreferMoreSpecificExtension2.kt

@@ -0,0 +1,10 @@
+package ppp
+
+class C {
+    fun foo() {
+        xx<caret>
+    }
+}
+
+// EXIST: { lookupString: "xxx", itemText: "xxx", tailText: "() for C in dependency", typeText: "Int" }
+// NOTHING_ELSE