nodejs
diff --git a/‎lib/readline.js‎
Lines changed: 13 additions & 1 deletion b/‎lib/readline.js‎
Lines changed: 13 additions & 1 deletion
diff --git a/‎test/parallel/test-readline-tab-complete.js‎
Lines changed: 36 additions & 0 deletions b/‎test/parallel/test-readline-tab-complete.js‎
Lines changed: 36 additions & 0 deletions
@@ -632,9 +632,21 @@ Interface.prototype._tabComplete = function(lastKeypressWasTab) {
     // If there is a common prefix to all matches, then apply that portion.
     const prefix = commonPrefix(ArrayPrototypeFilter(completions,
                                                      (e) => e !== ''));
-    if (prefix.length > completeOn.length) {
+    if (StringPrototypeStartsWith(prefix, completeOn) &&
+        prefix.length > completeOn.length) {
       this._insertString(StringPrototypeSlice(prefix, completeOn.length));
       return;
+    } else if (!StringPrototypeStartsWith(completeOn, prefix)) {
+      this.line = StringPrototypeSlice(this.line,
+                                       0,
+                                       this.cursor - completeOn.length) +
+                  prefix +
+                  StringPrototypeSlice(this.line,
+                                       this.cursor,
+                                       this.line.length);
+      this.cursor = this.cursor - completeOn.length + prefix.length;
+      this._refreshLine();
+      return;
     }
 
     if (!lastKeypressWasTab) {
 
@@ -100,3 +100,39 @@ common.skipIfDumbTerminal();
   });
   rli.close();
 }
+
+{
+  let output = '';
+  class FakeInput extends EventEmitter {
+    columns = 80
+
+    write = common.mustCall((data) => {
+      output += data;
+    }, 9)
+
+    resume() {}
+    pause() {}
+    end() {}
+  }
+
+  const fi = new FakeInput();
+  const rli = new readline.Interface({
+    input: fi,
+    output: fi,
+    terminal: true,
+    completer: common.mustCall((input, cb) => {
+      cb(null, [[input[0].toUpperCase() + input.slice(1)], input]);
+    }),
+  });
+
+  rli.on('line', common.mustNotCall());
+  fi.emit('data', 'input');
+  queueMicrotask(() => {
+    fi.emit('data', '\t');
+    queueMicrotask(() => {
+      assert.match(output, /> Input/);
+      output = '';
+      rli.close();
+    });
+  });
+}