Use binary expression as parent for better spacing (KT-27717)

When BINARY_EXPRESSION is used as parent, spacing rules for it are applied.
There're no rules for OPERATION_REFERENCE on the other side.

 #KT-27717 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/KotlinCommonBlock.kt

@@ -163,7 +163,15 @@ abstract class KotlinCommonBlock(
             operationBlock.requireNode(),
             subList(index, size),
             null, indent, wrap, spacingBuilder
-        ) { createSyntheticSpacingNodeBlock(it) }
+        ) {
+            val parent = it.treeParent ?: node
+            val skipOperationNodeParent = if (parent.elementType === KtNodeTypes.OPERATION_REFERENCE) {
+                parent.treeParent ?: parent
+            } else {
+                parent
+            }
+            createSyntheticSpacingNodeBlock(skipOperationNodeParent)
+        }
 
         return subList(0, index) + operationSyntheticBlock
     }

idea/formatter/src/org/jetbrains/kotlin/idea/formatter/SyntheticKotlinBlock.kt

@@ -27,7 +27,7 @@ class SyntheticKotlinBlock(
         private val indent: Indent?,
         private val wrap: Wrap?,
         private val spacingBuilder: KotlinSpacingBuilder,
-        private val createSyntheticSpacingNodeBlock: (ASTNode) -> ASTBlock
+        private val createParentSyntheticSpacingBlock: (ASTNode) -> ASTBlock
 ) : ASTBlock {
 
     private val textRange = TextRange(
@@ -44,7 +44,7 @@ class SyntheticKotlinBlock(
     override fun isLeaf() = false
     override fun getNode() = node
     override fun getSpacing(child1: Block?, child2: Block): Spacing? {
-        return spacingBuilder.getSpacing(createSyntheticSpacingNodeBlock(node.treeParent!!), child1, child2)
+        return spacingBuilder.getSpacing(createParentSyntheticSpacingBlock(node), child1, child2)
     }
 
 

idea/testData/formatter/SpacesAroundOperations.after.inv.kt

@@ -27,6 +27,11 @@ class Some {
         12%3*12/3
 
         1..2
+
+        null ?: 3+1
+
+        val a=1
+        null ?: a+a
     }
 }
 

idea/testData/formatter/SpacesAroundOperations.after.kt

@@ -27,6 +27,11 @@ class Some {
         12 % 3 * 12 / 3
 
         1 .. 2
+
+        null ?: 3 + 1
+
+        val a = 1
+        null ?: a + a
     }
 }
 

idea/testData/formatter/SpacesAroundOperations.kt

@@ -27,6 +27,11 @@ class Some {
         12%3*12/3
 
         1..2
+
+        null ?: 3 + 1
+
+        val a = 1
+        null ?: a + a
     }
 }