Make line numbers in the editor optional

browser/components/CodeEditor.js

@@ -50,7 +50,7 @@ export default class CodeEditor extends React.Component {
     this.value = this.props.value
     this.editor = CodeMirror(this.refs.root, {
       value: this.props.value,
-      lineNumbers: true,
+      lineNumbers: this.props.lineNumber,
       lineWrapping: true,
       theme: this.props.theme,
       indentUnit: this.props.indentSize,
@@ -141,6 +141,10 @@ export default class CodeEditor extends React.Component {
       this.editor.setOption('indentWithTabs', this.props.indentType !== 'space')
     }
 
+    if (prevProps.lineNumber !== this.props.lineNumber) {
+      this.editor.setOption('lineNumbers', this.props.lineNumber)
+    }
+
     if (needRefresh) {
       this.editor.refresh()
     }

browser/components/MarkdownEditor.js

@@ -213,6 +213,8 @@ class MarkdownEditor extends React.Component {
     if (!(editorFontSize > 0 && editorFontSize < 101)) editorFontSize = 14
     let editorIndentSize = parseInt(config.editor.indentSize, 10)
     if (!(editorFontSize > 0 && editorFontSize < 132)) editorIndentSize = 4
+    let editorLineNumber = config.editor.lineNumber
+    if (editorLineNumber === undefined) editorLineNumber = true
 
     let previewStyle = {}
     if (this.props.ignorePreviewPointerEvents) previewStyle.pointerEvents = 'none'
@@ -242,6 +244,7 @@ class MarkdownEditor extends React.Component {
           fontSize={editorFontSize}
           indentType={config.editor.indentType}
           indentSize={editorIndentSize}
+          lineNumber={editorLineNumber}
           storageKey={storageKey}
           onChange={(e) => this.handleChange(e)}
           onBlur={(e) => this.handleBlur(e)}