OC-16351 [swift override operator completion] provide caret position for invokeAutoPopup

Consider you want to autopopup completion only if there's a line feed before the caret.
If you're staying on a white space with a line feed inside you have to know the caret position
to make sure that the line feed is before it and not after:

Example:
The whitespace at caret does contain a line feed but it is after the caret position
```
class A { <caret>

}
```

platform/lang-api/src/com/intellij/codeInsight/completion/CompletionContributor.java

@@ -190,11 +190,20 @@ public abstract class CompletionContributor {
 
   /**
    * Allow autoPopup to appear after custom symbol
+   * @deprecated use {@link CompletionContributor#invokeAutoPopup(PsiElement, char, int)}
    */
+  @Deprecated
   public boolean invokeAutoPopup(@NotNull PsiElement position, char typeChar) {
     return false;
   }
 
+  /**
+   * Allow autoPopup to appear after custom symbol
+   */
+  public boolean invokeAutoPopup(@NotNull PsiElement position, char typeChar, int offset) {
+    return invokeAutoPopup(position, typeChar);
+  }
+
   /**
    * Invoked in a read action in parallel to the completion process. Used to calculate the replacement offset
    * (see {@link CompletionInitializationContext#setReplacementOffset(int)})

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

@@ -289,7 +289,7 @@ public class TypedHandler extends TypedActionHandlerBase {
       final PsiElement element = file.findElementAt(offset);
       if (element != null) {
         for (CompletionContributor contributor : CompletionContributor.forLanguageHonorDumbness(element.getLanguage(), file.getProject())) {
-          if (contributor.invokeAutoPopup(element, charTyped)) {
+          if (contributor.invokeAutoPopup(element, charTyped, offset + 1)) {
             LOG.debug(contributor + " requested completion autopopup when typing '" + charTyped + "'");
             return true;
           }