[vcs-log] fix extra space in time string, add tests

platform/vcs-log/impl/src/com/intellij/vcs/log/util/StopWatch.java

@@ -91,9 +91,12 @@ public class StopWatch {
         result += quotient + (msec == 0 ? "" : "." + String.format(M_SEC_FORMAT, msec)) + UNIT_NAMES[i];
       }
       else {
-        result += quotient + UNIT_NAMES[i] + " ";
-        if (remainder == 0 && msec != 0) {
-          result += "0." + String.format(M_SEC_FORMAT, msec) + UNIT_NAMES[0];
+        result += quotient + UNIT_NAMES[i];
+        if (remainder != 0 || msec != 0) {
+          result += " ";
+          if (remainder == 0) {
+            result += "0." + String.format(M_SEC_FORMAT, msec) + UNIT_NAMES[0];
+          }
         }
       }
     }

platform/vcs-log/impl/test/com/intellij/vcs/log/util/StopWatchTest.kt

@@ -0,0 +1,22 @@
+// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package com.intellij.vcs.log.util
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class StopWatchTestCase {
+  @Test
+  fun testEvenMinutes() {
+    assertEquals("1m", StopWatch.formatTime(60000))
+  }
+
+  @Test
+  fun testEvenSeconds() {
+    assertEquals("1m 5s", StopWatch.formatTime(65000))
+  }
+
+  @Test
+  fun testUnEvenSeconds() {
+    assertEquals("1m 5.100s", StopWatch.formatTime(65100))
+  }
+}