fix mledit soft keyboard return bug

docs/changes.md

@@ -2,6 +2,7 @@
 * 2019/10/09
   * slider 的min/max/value/step使用浮动数。
   * combo\_box 增加item\_height属性(感谢朝泽提供补丁)。
+  * 修改mledit软键盘回车的问题（感谢俊杰提供补丁）。
 
 * 2019/10/08
   * 增加istream buffered。

src/base/input_method.c

@@ -90,7 +90,7 @@ ret_t input_method_dispatch_action(input_method_t* im) {
 
   input_method_dispatch(im, &e);
 
-  if (im->engine != NULL && im->action_buton_text[0] == '\0') {
+  if (im->engine != NULL && im->engine->keys.size > 0) {
     char text[64];
     tk_strncpy(text, im->engine->keys.str, sizeof(text) - 1);
     input_method_commit_text(im, text);

src/ext_widgets/mledit/mledit.c

@@ -391,6 +391,10 @@ static ret_t mledit_on_event(widget_t* widget, event_t* e) {
       mledit_update_status(widget);
       break;
     }
+    case EVT_IM_ACTION : {
+      mledit_commit_str(widget, "\n");
+      break;
+    }
     case EVT_KEY_UP: {
       break;
     }

src/streams/iostream_mem.h

@@ -34,7 +34,7 @@ typedef struct _tk_iostream_mem_t tk_iostream_mem_t;
  * @class tk_iostream_mem_t
  * @parent tk_iostream_t
  *
- * input stream base on mem
+ * iostream base on mem
  *
  */
 struct _tk_iostream_mem_t {

src/tkc/object.h

@@ -554,6 +554,8 @@ float_t object_get_prop_float_by_path(object_t* obj, const char* path, float_t d
 
 #define OBJECT(obj) ((object_t*)(obj))
 
+#define OBJECT_UNREF(obj) if((obj) != NULL) { object_unref((object_t*)(obj)); (obj) = NULL; }
+
 END_C_DECLS
 
 #endif /*TK_OBJECT_H*/