diff: move method

platform/diff-api/src/com/intellij/diff/util/Range.java

@@ -56,4 +56,8 @@ public class Range {
   public String toString() {
     return "[" + start1 + ", " + end1 + ") - [" + start2 + ", " + end2 + ")";
   }
+
+  public boolean isEmpty() {
+    return start1 == end1 && start2 == end2;
+  }
 }

platform/diff-impl/src/com/intellij/diff/comparison/ByWord.java

@@ -494,7 +494,7 @@ public class ByWord {
 
         Range expand = new Range(range.start1 + startCut, range.end1 - endCut, range.start2 + startCut, range.end2 - endCut);
 
-        if (!isEmpty(expand)) {
+        if (!expand.isEmpty()) {
           myChanges.add(expand);
         }
       }
@@ -528,7 +528,7 @@ public class ByWord {
       for (Range range : myIterable.iterateChanges()) {
         Range trimmed = trim(myText1, myText2, range);
 
-        if (!isEmpty(trimmed)) {
+        if (!trimmed.isEmpty()) {
           myChanges.add(trimmed);
         }
       }
@@ -580,7 +580,7 @@ public class ByWord {
 
         Range trimmed = new Range(start1, end1, start2, end2);
 
-        if (!isEmpty(trimmed)) {
+        if (!trimmed.isEmpty()) {
           myChanges.add(trimmed);
         }
       }

platform/diff-impl/src/com/intellij/diff/comparison/LineFragmentSplitter.java

@@ -94,7 +94,7 @@ class LineFragmentSplitter {
     if (last1 > end1 || last2 > end2) return;
 
     WordBlock block = createBlock(last1, last2, end1, end2);
-    if (DiffIterableUtil.isEmpty(block.offsets)) return;
+    if (block.offsets.isEmpty()) return;
 
     WordBlock lastBlock = ContainerUtil.getLastItem(myResult);
 

platform/diff-impl/src/com/intellij/diff/comparison/iterables/DiffIterableUtil.java

@@ -181,10 +181,6 @@ public class DiffIterableUtil {
     };
   }
 
-  public static boolean isEmpty(@NotNull Range range) {
-    return range.start1 == range.end1 && range.start2 == range.end2;
-  }
-
   //
   // Verification
   //

platform/diff-impl/src/com/intellij/diff/comparison/iterables/SubiterableDiffIterable.java

@@ -68,7 +68,7 @@ class SubiterableDiffIterable extends ChangeDiffIterableBase {
 
         myLast = new Range(Math.max(myStart1, range.start1) - myStart1, Math.min(myEnd1, range.end1) - myStart1,
                            Math.max(myStart2, range.start2) - myStart2, Math.min(myEnd2, range.end2) - myStart2);
-        if (!DiffIterableUtil.isEmpty(myLast)) break;
+        if (!myLast.isEmpty()) break;
         myLast = null;
       }
     }