Inline Void block cursor (#1886)

* add contentEditable=false to void block wrapper

* put contentEditable fals on inline void

fix from https://github.com/ianstormtaylor/slate/pull/1734 works for block but inline void have a cursor which shouldn’t be there as typing inside inline void won’t work. so only removing contentEditable on blocks but not inline

* update test

packages/slate-react/src/components/void.js

@@ -79,7 +79,11 @@ class Void extends React.Component {
     this.debug('render', { props })
 
     return (
-      <Tag data-slate-void data-key={node.key}>
+      <Tag
+        data-slate-void
+        data-key={node.key}
+        contentEditable={readOnly || node.object == 'block' ? null : false}
+      >
         {readOnly ? null : spacer}
         {content}
       </Tag>

packages/slate-react/test/rendering/fixtures/custom-inline-void.js

@@ -36,7 +36,7 @@ export const output = `
         <span data-slate-zero-width="z">&#x200B;</span>
       </span>
     </span>
-    <span data-slate-void="true">
+    <span data-slate-void="true" contenteditable="false">
       <span data-slate-spacer="true" style="height:0;color:transparent;outline:none;position:absolute">
         <span>
           <span>