add "Wrap Line" button handlers

browser/main/Detail/SnippetNoteDetail.js

@@ -518,6 +518,19 @@ class SnippetNoteDetail extends React.Component {
     ])
   }
 
+  handleWrapLineButtonClick (e) {
+    context.popup([
+      {
+        label: 'on',
+        click: (e) => this.handleWrapLineItemClick(e, true)
+      },
+      {
+        label: 'off',
+        click: (e) => this.handleWrapLineItemClick(e, false)
+      }
+    ])
+  }
+
   handleIndentSizeItemClick (e, indentSize) {
     const { config, dispatch } = this.props
     const editor = Object.assign({}, config.editor, {
@@ -550,6 +563,22 @@ class SnippetNoteDetail extends React.Component {
     })
   }
 
+  handleWrapLineItemClick (e, lineWrapping) {
+    const { config, dispatch } = this.props
+    const editor = Object.assign({}, config.editor, {
+      lineWrapping
+    })
+    ConfigManager.set({
+      editor
+    })
+    dispatch({
+      type: 'SET_CONFIG',
+      config: {
+        editor
+      }
+    })
+  }
+
   focus () {
     this.refs.description.focus()
   }