Fix incremental analysis for whitespaces

incremental analysis could ignore whitespace iff old item was whitespace

#KT-37629 Fixed

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/trackers/KotlinCodeBlockModificationListener.kt

@@ -181,23 +181,24 @@ class KotlinCodeBlockModificationListener(
             }
         }
 
-        private fun isCommentChange(changeSet: TreeChangeEvent): Boolean =
+        private fun isSpecificChange(changeSet: TreeChangeEvent, precondition: (ASTNode?) -> Boolean): Boolean =
             changeSet.changedElements.all { changedElement ->
                 val changesByElement = changeSet.getChangesByElement(changedElement)
                 changesByElement.affectedChildren.all { affectedChild ->
-                    if (!(affectedChild is PsiComment || affectedChild is KDoc)) return@all false
+                    if (!precondition(affectedChild)) return@all false
                     val changeByChild = changesByElement.getChangeByChild(affectedChild)
                     return@all if (changeByChild is ChangeInfoImpl) {
                         val oldChild = changeByChild.oldChild
-                        oldChild is PsiComment || oldChild is KDoc
+                        precondition(oldChild)
                     } else false
                 }
             }
 
+        private fun isCommentChange(changeSet: TreeChangeEvent): Boolean =
+            isSpecificChange(changeSet) { it is PsiComment || it is KDoc }
+
         private fun isFormattingChange(changeSet: TreeChangeEvent): Boolean =
-            changeSet.changedElements.all {
-                changeSet.getChangesByElement(it).affectedChildren.all { c -> c is PsiWhiteSpace }
-            }
+            isSpecificChange(changeSet) { it is PsiWhiteSpace }
 
         /**
          * Has to be aligned with [getInsideCodeBlockModificationScope] :

idea/testData/codeInsight/outOfBlock/InfixFunWhitespace.kt

@@ -0,0 +1,7 @@
+// OUT_OF_CODE_BLOCK: FALSE
+// TYPE: ' '
+fun main() {
+    "x"<caret>foo 4.0
+}
+
+infix fun String.foo(s: Double) = Unit

idea/tests/org/jetbrains/kotlin/idea/codeInsight/OutOfBlockModificationTestGenerated.java

@@ -318,6 +318,11 @@ public class OutOfBlockModificationTestGenerated extends AbstractOutOfBlockModif
         runTest("idea/testData/codeInsight/outOfBlock/InUninitializedPropertyAccessor.kt");
     }
 
+    @TestMetadata("InfixFunWhitespace.kt")
+    public void testInfixFunWhitespace() throws Exception {
+        runTest("idea/testData/codeInsight/outOfBlock/InfixFunWhitespace.kt");
+    }
+
     @TestMetadata("InitBlock.kt")
     public void testInitBlock() throws Exception {
         runTest("idea/testData/codeInsight/outOfBlock/InitBlock.kt");