Double-click to select current block

This is a Eclipse-like feature, for select enclosing element.
e.g.
int test() {| // Here is the cursor position
    ...
}
When Double-click, we can select the block: {...}
I think this is a useful feature.

Change-Id: I4ca7ed04056176195d1622714effda9079ae0e44
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>

src/plugins/texteditor/basetextdocumentlayout.cpp

@@ -201,7 +201,7 @@ TextBlockUserData::MatchType TextBlockUserData::checkClosedParenthesis(QTextCurs
     }
 }
 
-bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select)
+bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool select, bool onlyInCurrentBlock)
 {
     QTextBlock block = cursor->block();
     int position = cursor->position();
@@ -224,6 +224,8 @@ bool TextBlockUserData::findPreviousOpenParenthesis(QTextCursor *cursor, bool se
                 }
             }
         }
+        if (onlyInCurrentBlock)
+            return false;
         block = block.previous();
     }
     return false;