Fix: 阻止了Block中的文字被选中

Author: Zecyel

src/vf/flowgraph/block.ts

@@ -56,6 +56,7 @@ class Block extends ElementBase<{
             text.setAttribute('font-family', i.font)
             text.setAttribute('font-size', i.size + 'px')
             text.setAttribute('fill', i.color.hex())
+            text.style.userSelect = 'none'
             appendChild(this, text)
             this.text_el.push(text)
         }

src/vf/type/line.ts

@@ -38,7 +38,7 @@ class Line {
         this.el.setAttribute('fill', 'none')
         appendChild(flowgraph.el, this)
 
-        this.el.addEventListener('click', () => {
+        this.el.addEventListener('dblclick', () => {
             line_pool.remove_line(this)
             this.destructor()
         })