add getCaretCount method to caret model API (IDEA-80056)

platform/editor-ui-api/src/com/intellij/openapi/editor/CaretModel.java

@@ -180,6 +180,11 @@ public interface CaretModel {
   @NotNull
   Caret getPrimaryCaret();
 
+  /**
+   * Returns number of carets currently existing in the document
+   */
+  int getCaretCount();
+
   /**
    * Returns all carets currently existing in the document, ordered by their position in the document.
    */

platform/lang-impl/src/com/intellij/codeInsight/editorActions/PasteHandler.java

@@ -90,7 +90,7 @@ public class PasteHandler extends EditorActionHandler implements EditorTextInser
 
     final Project project = editor.getProject();
     if (project == null || editor.isColumnMode() || editor.getSelectionModel().hasBlockSelection()
-        || editor.getCaretModel().getAllCarets().size() > 1) {
+        || editor.getCaretModel().getCaretCount() > 1) {
       if (myOriginalHandler != null) {
         myOriginalHandler.execute(editor, context);
       }

platform/lang-impl/src/com/intellij/codeInsight/editorActions/TypedHandler.java

@@ -191,7 +191,7 @@ public class TypedHandler extends TypedActionHandlerBase {
       }
     }
 
-    if (!editor.getSelectionModel().hasBlockSelection() && editor.getCaretModel().getAllCarets().size() == 1) {
+    if (!editor.getSelectionModel().hasBlockSelection() && editor.getCaretModel().getCaretCount() == 1) {
       if (')' == charTyped || ']' == charTyped || '}' == charTyped) {
         if (FileTypes.PLAIN_TEXT != fileType) {
           if (handleRParen(editor, fileType, charTyped)) return;
@@ -210,7 +210,7 @@ public class TypedHandler extends TypedActionHandlerBase {
 
     if (('(' == charTyped || '[' == charTyped || '{' == charTyped) &&
         CodeInsightSettings.getInstance().AUTOINSERT_PAIR_BRACKET &&
-        !editor.getSelectionModel().hasBlockSelection() && editor.getCaretModel().getAllCarets().size() == 1 && fileType != FileTypes.PLAIN_TEXT) {
+        !editor.getSelectionModel().hasBlockSelection() && editor.getCaretModel().getCaretCount() == 1 && fileType != FileTypes.PLAIN_TEXT) {
       handleAfterLParen(editor, fileType, charTyped);
     }
     else if ('}' == charTyped) {

platform/lang-impl/src/com/intellij/codeInsight/template/impl/TemplateState.java

@@ -167,7 +167,7 @@ public class TemplateState implements Disposable {
   }
 
   private boolean isMultiCaretMode() {
-    return myEditor != null && myEditor.getCaretModel().supportsMultipleCarets() && myEditor.getCaretModel().getAllCarets().size() > 1;
+    return myEditor != null && myEditor.getCaretModel().getCaretCount() > 1;
   }
 
   @Override

platform/lang-impl/src/com/intellij/injected/editor/CaretModelWindow.java

@@ -165,6 +165,11 @@ public class CaretModelWindow implements CaretModel {
     return createInjectedCaret(myDelegate.getPrimaryCaret());
   }
 
+  @Override
+  public int getCaretCount() {
+    return myDelegate.getCaretCount();
+  }
+
   @NotNull
   @Override
   public List<Caret> getAllCarets() {

platform/lang-impl/src/com/intellij/openapi/editor/actions/UnselectPreviousOccurrenceAction.java

@@ -35,7 +35,7 @@ public class UnselectPreviousOccurrenceAction extends EditorAction {
 
     @Override
     public void execute(Editor editor, @Nullable Caret caret, DataContext dataContext) {
-      if (editor.getCaretModel().getAllCarets().size() > 1) {
+      if (editor.getCaretModel().getCaretCount() > 1) {
         editor.getCaretModel().removeCaret(editor.getCaretModel().getPrimaryCaret());
       }
       else {

platform/platform-api/src/com/intellij/openapi/editor/EditorModificationUtil.java

@@ -165,7 +165,7 @@ public class EditorModificationUtil {
     if (text == null) return null;
 
     if (editor.getCaretModel().supportsMultipleCarets()) {
-      int caretCount = editor.getCaretModel().getAllCarets().size();
+      int caretCount = editor.getCaretModel().getCaretCount();
       final Iterator<String> segments = new ClipboardTextPerCaretSplitter().split(text, caretCount).iterator();
       editor.getCaretModel().runForEachCaret(new CaretAction() {
         @Override

platform/platform-impl/src/com/intellij/openapi/editor/actions/EscapeAction.java

@@ -50,7 +50,7 @@ public class EscapeAction extends EditorAction {
     public boolean isEnabled(Editor editor, DataContext dataContext) {
       SelectionModel selectionModel = editor.getSelectionModel();
       CaretModel caretModel = editor.getCaretModel();
-      return selectionModel.hasSelection() || selectionModel.hasBlockSelection() || caretModel.getAllCarets().size() > 1;
+      return selectionModel.hasSelection() || selectionModel.hasBlockSelection() || caretModel.getCaretCount() > 1;
     }
   }
 }

platform/platform-impl/src/com/intellij/openapi/editor/impl/CaretModelImpl.java

@@ -240,6 +240,13 @@ public class CaretModelImpl implements CaretModel, PrioritizedDocumentListener,
     }
   }
 
+  @Override
+  public int getCaretCount() {
+    synchronized (myCarets) {
+      return myCarets.size();
+    }
+  }
+
   @Override
   @NotNull
   public List<Caret> getAllCarets() {

platform/platform-impl/src/com/intellij/openapi/editor/textarea/TextComponentCaretModel.java

@@ -150,6 +150,11 @@ public class TextComponentCaretModel implements CaretModel {
     return myCaret;
   }
 
+  @Override
+  public int getCaretCount() {
+    return 1;
+  }
+
   @NotNull
   @Override
   public List<Caret> getAllCarets() {