QualifiedExpressionResolver: change root prefix from _Qfadj4tPV to _root_ide_package_

compiler/frontend/src/org/jetbrains/kotlin/resolve/QualifiedExpressionResolver.kt

@@ -789,11 +789,11 @@ class QualifiedExpressionResolver(val languageVersionSettings: LanguageVersionSe
          *
          *  fun test(a: Any) {
          *      a.A() // invalid code -> incorrect import/completion/etc.
-         *      _Qfadj4tPV.a.A() // OK
+         *      _root_ide_package_.a.A() // OK
          *  }
          *  ---------
          */
-        const val ROOT_PREFIX_FOR_IDE_RESOLUTION_MODE = "_Qfadj4tPV"
+        const val ROOT_PREFIX_FOR_IDE_RESOLUTION_MODE = "_root_ide_package_"
         const val ROOT_PREFIX_FOR_IDE_RESOLUTION_MODE_WITH_DOT = "$ROOT_PREFIX_FOR_IDE_RESOLUTION_MODE."
     }
 }

idea/testData/shortenRefs/PropertyFunctionConflict.kt

@@ -2,6 +2,6 @@ package a
 
 class Goo {
     fun x() {
-        <selection>_Qfadj4tPV.a.b.foo()</selection>
+        <selection>_root_ide_package_.a.b.foo()</selection>
     }
 }

idea/testData/shortenRefs/type/ClassSameNameAsPackage.kt

@@ -1,3 +1,3 @@
 
-fun f(s: <selection>_Qfadj4tPV.same.same</selection>) {
+fun f(s: <selection>_root_ide_package_.same.same</selection>) {
 }