Shorten References: Do not optimize imports until shortening is finished

#KT-5227 Fixed

idea/testData/shortenRefs/imports/leaveQualifiedConstructor.kt

@@ -0,0 +1,4 @@
+// OPTIMIZE_IMPORTS
+import java.util.Date
+
+val x = <selection>java.sql.Date(1)</selection>

idea/testData/shortenRefs/imports/leaveQualifiedConstructor.kt.after

@@ -0,0 +1,4 @@
+// OPTIMIZE_IMPORTS
+import java.sql.Date
+
+val x = Date(1)

idea/testData/shortenRefs/imports/leaveQualifiedType.kt

@@ -0,0 +1,4 @@
+// OPTIMIZE_IMPORTS
+import java.util.Date
+
+class A : <selection>java.sql.Date</selection>

idea/testData/shortenRefs/imports/leaveQualifiedType.kt.after

@@ -0,0 +1,4 @@
+// OPTIMIZE_IMPORTS
+import java.sql.Date
+
+class A : Date

idea/testData/shortenRefs/imports/optimizeMultipleImports.kt

@@ -0,0 +1,4 @@
+// OPTIMIZE_IMPORTS
+import java.io.*
+
+<selection>class A(val d: java.sql.Date, val rs: java.sql.ResultSet)</selection>

idea/testData/shortenRefs/imports/optimizeMultipleImports.kt.after

@@ -0,0 +1,5 @@
+// OPTIMIZE_IMPORTS
+import java.sql.Date
+import java.sql.ResultSet
+
+class A(val d: Date, val rs: ResultSet)