Fix diff

app/src/components/CodeDiff.tsx

@@ -27,17 +27,20 @@ class CodeDiff extends React.Component<Props, {}> {
       const changedLines = change.count || 0
       if (hasStyledCode && this.props.language === 'json') {
         const currentLines = styledLines.slice(lineNumber, lineNumber + changedLines)
-        const lines = currentLines.map((l, k) => {
-          return <div key={k}><span className={this.cssClassForChange(change)} dangerouslySetInnerHTML={{ __html: l }} /></div>
+        const lines = currentLines.map((l, idx) => {
+          return <div key={`${key}-${idx}`} className={this.props.classes.line}><span className={this.cssClassForChange(change)} dangerouslySetInnerHTML={{ __html: l }} /></div>
         })
         lineNumber += changedLines
 
         return <div key={key}>{lines}</div>
       }
 
-      return change.value.trim().split('\n').map((line, idx) => {
-        return <div key={`${key}-${idx}`}><span className={this.cssClassForChange(change)}>{line}</span></div>
-      })
+      return change.value
+        .slice(0, -1) // Remove trailing newline
+        .split('\n')
+        .map((line, idx) => {
+          return <div key={`${key}-${idx}`} className={this.props.classes.line}><span className={this.cssClassForChange(change)}>{line}</span></div>
+        })
     })
 
     return (
@@ -69,6 +72,9 @@ const style = (theme: Theme) => {
     // width: '8px',
   }
   return {
+    line: {
+      lineHeight: 'normal',
+    },
     codeBlock: {
       fontSize: '12px',
       maxHeight: '200px',
@@ -78,7 +84,6 @@ const style = (theme: Theme) => {
       ...baseStyle,
       '&:before': {
         ...before,
-        // content: "' '",
       },
     },
     deletion: {