Select word on double click even when at boundary

Now when double clicking on a boundary of a word, the
word is selected. This also causes single-letter words
to now be selected (fixes #9159).

src/Text3.cpp

@@ -1538,7 +1538,7 @@ void Text::dispatch(Cursor & cur, FuncRequest & cmd)
 
 	case LFUN_MOUSE_DOUBLE:
 		if (cmd.button() == mouse_button::button1) {
-			selectWord(cur, WHOLE_WORD_STRICT);
+			selectWord(cur, WHOLE_WORD);
 			bv->cursor() = cur;
 		}
 		break;