fix IOOBE when processing notifications with multiple newlines (EA-33445)

platform/platform-impl/src/com/intellij/notification/EventLog.java

@@ -235,10 +235,10 @@ public class EventLog implements Notifications {
   }
 
   private static void removeJavaNewLines(Document document, List<RangeMarker> lineSeparators, boolean hasHtml) {
-    String text = document.getText();
-    int i = -1;
+    CharSequence text = document.getCharsSequence();
+    int i = 0;
     while (true) {
-      i = text.indexOf('\n', i + 1);
+      i = StringUtil.indexOf(text, '\n', i);
       if (i < 0) break;
       document.deleteString(i, i + 1);
       if (!hasHtml) {

platform/platform-tests/testSrc/com/intellij/notification/EventLogTest.groovy

@@ -74,4 +74,8 @@ class EventLogTest extends LightPlatformTestCase {
     assert EventLog.formatForLog(new Notification("xxx", 'title', "foo<br/>Bar", NotificationType.ERROR)).message ==  'title: foo // Bar'
   }
 
+  public void testManyNewlines() throws Exception {
+    assert EventLog.formatForLog(new Notification("xxx", 'title', "foo\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nbar", NotificationType.ERROR)).message ==  'title: foo bar'
+  }
+
 }