From 0050cb830c3d4c7139f4e78b35a07297cd86ba25 Mon Sep 17 00:00:00 2001
From: Sliman Said <sliman.said@outlook.com>
Date: Fri, 8 Nov 2019 17:21:43 +0100
Subject: [PATCH] [useAutocomplete] Handle Opera fullscreen mode (#18275)

---
 .../src/useAutocomplete/useAutocomplete.js                | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/packages/material-ui-lab/src/useAutocomplete/useAutocomplete.js b/packages/material-ui-lab/src/useAutocomplete/useAutocomplete.js
index 2ebd2905d3ac7f..095d4bd91815d5 100644
--- a/packages/material-ui-lab/src/useAutocomplete/useAutocomplete.js
+++ b/packages/material-ui-lab/src/useAutocomplete/useAutocomplete.js
@@ -537,9 +537,15 @@ export default function useAutocomplete(props) {
         break;
       case 'Escape':
         if (popupOpen) {
+          // Avoid Opera to exit fullscreen mode.
+          event.preventDefault();
+          // Avoid the Modal to handle the event.
           event.stopPropagation();
           handleClose(event);
-        } else if (clearOnEscape) {
+        } else if (clearOnEscape && inputValue !== '') {
+          // Avoid Opera to exit fullscreen mode.
+          event.preventDefault();
+          // Avoid the Modal to handle the event.
           event.stopPropagation();
           handleClear(event);
         }