fix problem with extending sorted set by one and attempting to increase random access capacity in case of value removal

platform/lang-impl/src/com/intellij/util/indexing/containers/ChangeBufferingList.java

@@ -78,10 +78,10 @@ public class ChangeBufferingList implements Cloneable {
   }
 
   public void remove(int value) {
-    ensureCapacity(1);
     if (DEBUG) checkSet.remove(value);
     RandomAccessIntContainer intContainer = randomAccessContainer;
     if (intContainer == null) {
+      ensureCapacity(1);
       addChange(-value);
     }
     else {
@@ -197,22 +197,25 @@ public class ChangeBufferingList implements Cloneable {
     if (changes == null) {
       changes = new int[Math.max(3, diff)];
     } else if (length + diff > changes.length) {
-      int nextArraySize = Math.min(
-        Math.max(changes.length < 1024 ? changes.length << 1 : changes.length + changes.length / 5, length + diff),
-        MAX_FILES
-      );
-      int[] newChanges = new int[nextArraySize];
+      int[] newChanges = new int[calcNextArraySize(changes.length, length + diff)];
       System.arraycopy(changes, 0, newChanges, 0, length);
       changes = newChanges;
     }
   }
 
+  static int calcNextArraySize(int currentSize, int wantedSize) {
+    return Math.min(
+          Math.max(currentSize < 1024 ? currentSize << 1 : currentSize + currentSize / 5, wantedSize),
+          MAX_FILES
+        );
+  }
+
   public boolean isEmpty() {
     if (randomAccessContainer == null) {
       if (changes == null) return true;
       if (removals == 0) return length == 0;
     }
-    // todo we can
+    // todo we can calculate isEmpty in more cases (without container)
     RandomAccessIntContainer intContainer = getRandomAccessContainer();
     return intContainer.size() == 0;
   }

platform/lang-impl/src/com/intellij/util/indexing/containers/SortedIdSet.java

@@ -200,16 +200,19 @@ public class SortedIdSet implements Cloneable, RandomAccessIntContainer {
   }
 
   public RandomAccessIntContainer ensureContainerCapacity(int count) {
-    if (mySize + count > ChangeBufferingList.MAX_FILES) {
+    int newSize = mySetLength + count;
+    if (newSize < mySet.length) return this;
+    if (newSize > ChangeBufferingList.MAX_FILES) {
       return new IdBitSet(this, count);
     }
-    int newSize = mySetLength + count;
+
+    newSize = ChangeBufferingList.calcNextArraySize(mySet.length, newSize);
     assert newSize < Short.MAX_VALUE;
-    if (newSize >= mySet.length) {
-      int[] newSet = new int[newSize]; // todo slightly increase size and compact
-      System.arraycopy(mySet, 0, newSet, 0, mySetLength);
-      mySet = newSet;
-    }
+
+    int[] newSet = new int[newSize]; // todo slightly increase size and compact
+    System.arraycopy(mySet, 0, newSet, 0, mySetLength);
+    mySet = newSet;
+
     return this;
   }