Feature：按住根节点也可以拖动画布

simple-mind-map/src/Node.js

@@ -672,11 +672,15 @@ class Node {
       this.active(e)
     })
     this.group.on('mousedown', e => {
-      e.stopPropagation()
+      if (!this.isRoot) {
+        e.stopPropagation()
+      }
       this.mindMap.emit('node_mousedown', this, e)
     })
     this.group.on('mouseup', e => {
-      e.stopPropagation()
+      if (!this.isRoot) {
+        e.stopPropagation()
+      }
       this.mindMap.emit('node_mouseup', this, e)
     })
     this.group.on('mouseenter', e => {

web/src/pages/Doc/en/changelog/index.md

@@ -2,7 +2,7 @@
 
 ## 0.4.5
 
-New: Supports associative lines.
+New: 1.Supports associative lines. 2.You can also drag the canvas by holding down the root node.
 
 ## 0.4.4
 

web/src/pages/Doc/en/changelog/index.vue

@@ -2,7 +2,7 @@
   <div>
     <h1>Changelog</h1>
 <h2>0.4.5</h2>
-<p>New: Supports associative lines.</p>
+<p>New: 1.Supports associative lines. 2.You can also drag the canvas by holding down the root node.</p>
 <h2>0.4.4</h2>
 <p>New: Support horizontal scrolling in response to the mouse.</p>
 <h2>0.4.3</h2>

web/src/pages/Doc/zh/changelog/index.md

@@ -2,7 +2,7 @@
 
 ## 0.4.5
 
-新增：支持关联线。
+新增：1.支持关联线。 2.按住根节点也可以拖动画布。
 
 ## 0.4.4
 

web/src/pages/Doc/zh/changelog/index.vue

@@ -2,7 +2,7 @@
   <div>
     <h1>Changelog</h1>
 <h2>0.4.5</h2>
-<p>新增：支持关联线。</p>
+<p>新增：1.支持关联线。 2.按住根节点也可以拖动画布。</p>
 <h2>0.4.4</h2>
 <p>新增：支持响应鼠标的横向滚动。</p>
 <h2>0.4.3</h2>