更新 修复部分平台拖拽消息输入框高度的线层级不够的问题

components/uni-im-chat-input/uni-im-chat-input.vue

@@ -146,7 +146,7 @@
           if (isMove) {
             const moveY = startY - e.clientY;
             const height = startHeight + moveY;
-            if(height > 500){
+            if(height > 800){
               // 改变鼠标样式，为向下箭头
               document.body.style.cursor = 's-resize';
             }else if(height < 200){
@@ -418,11 +418,12 @@
     #drag-line {
       // 鼠标变上下拖动的光标
       cursor: ns-resize;
-      height: 3px;
+      height: 5px;
       position: absolute;
       left: 0;
-      top: 0;
+      top: -3px;
       width: 100%;
+      z-index: 1;
     }
     .main {
       .icon {