Fix KT-16725; Remove spaces between array indices

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

@@ -257,6 +257,8 @@ fun createSpacingBuilder(settings: CodeStyleSettings, builderUtil: KotlinSpacing
 
             around(BY_KEYWORD).spaces(1)
             betweenInside(IDENTIFIER, PROPERTY_DELEGATE, PROPERTY).spaces(1)
+
+            before(INDICES).spaces(0)
         }
         custom {
 

idea/testData/formatter/ArrayAccess.after.kt

@@ -8,13 +8,13 @@ fun test() {
             1, 2
             ]
 
-    a    [
+    a[
 
             1, 2
 
             ]
 
-    a    [
+    a[
 
 
             1, 2

idea/testData/formatter/SpaceBeforeIndices.after.kt

@@ -0,0 +1,2 @@
+val array = emptyArray<Any>()
+val foo = array[0]

idea/testData/formatter/SpaceBeforeIndices.kt

@@ -0,0 +1,2 @@
+val array = emptyArray<Any>()
+val foo = array   [0]

idea/testData/quickfix/addNewLineAfterAnnotations/poorlyFormattedExpression.kt.after

@@ -6,5 +6,5 @@ annotation class Ann
 fun foo(y: IntArray) {
     // Currently it calls reformatting of base expression, but it seems to be a minor issue
     @Ann
-    y [0 + 9 * 4] = y[y [1]]
+    y[0 + 9 * 4] = y[y [1]]
 }

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

@@ -596,6 +596,12 @@ public class FormatterTestGenerated extends AbstractFormatterTest {
             doTest(fileName);
         }
 
+        @TestMetadata("SpaceBeforeIndices.after.kt")
+        public void testSpaceBeforeIndices() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/SpaceBeforeIndices.after.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("SpacedInsideParans.after.kt")
         public void testSpacedInsideParans() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/formatter/SpacedInsideParans.after.kt");