Format spaces around semicolon

Fixes #KT-12689

Author: cypressious

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

@@ -219,6 +219,9 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
 
             afterInside(ANNOTATION_ENTRY, ANNOTATED_EXPRESSION).spaces(1)
 
+            before(SEMICOLON).spaces(0)
+            after(SEMICOLON).spaces(1)
+
             val TYPE_COLON_ELEMENTS = TokenSet.create(PROPERTY, FUN, VALUE_PARAMETER, DESTRUCTURING_DECLARATION_ENTRY, FUNCTION_LITERAL)
             beforeInside(COLON, TYPE_COLON_ELEMENTS) { spaceIf(kotlinSettings.SPACE_BEFORE_TYPE_COLON) }
             afterInside(COLON, TYPE_COLON_ELEMENTS) { spaceIf(kotlinSettings.SPACE_AFTER_TYPE_COLON) }

idea/testData/formatter/Semicolon.after.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    ""; ""
+}

idea/testData/formatter/Semicolon.kt

@@ -0,0 +1,3 @@
+fun foo() {
+    ""  ;   ""
+}

idea/tests/org/jetbrains/kotlin/formatter/FormatterTestGenerated.java

@@ -517,6 +517,12 @@ public void testSecondaryCtorLineBreak() throws Exception {
             doTest(fileName);
         }
 
+        @TestMetadata("Semicolon.after.kt")
+        public void testSemicolon() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/Semicolon.after.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("SingleLineFunctionLiteral.after.kt")
         public void testSingleLineFunctionLiteral() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/SingleLineFunctionLiteral.after.kt");