From 00969fe1e5ed8cab35b1fbbd682fa12ee263c1a8 Mon Sep 17 00:00:00 2001
From: "trop[bot]" <37223003+trop[bot]@users.noreply.github.com>
Date: Thu, 30 Sep 2021 08:39:21 -0400
Subject: [PATCH] fix: BrowserView drag now delegates to the OS when possible
 (#31176)

Co-authored-by: @anulman <@anulman>
---
 shell/browser/native_browser_view_mac.mm | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/shell/browser/native_browser_view_mac.mm b/shell/browser/native_browser_view_mac.mm
index 06a86ebc0e0b4..b5a25c747eb53 100644
--- a/shell/browser/native_browser_view_mac.mm
+++ b/shell/browser/native_browser_view_mac.mm
@@ -59,7 +59,8 @@ + (void)load {
 }
 
 - (BOOL)mouseDownCanMoveWindow {
-  return NO;
+  return
+      [self.window respondsToSelector:@selector(performWindowDragWithEvent:)];
 }
 
 - (BOOL)acceptsFirstMouse:(NSEvent*)event {
@@ -85,16 +86,15 @@ - (NSView*)hitTest:(NSPoint)point {
 - (void)mouseDown:(NSEvent*)event {
   [super mouseDown:event];
 
-  if ([self.window respondsToSelector:@selector(performWindowDragWithEvent)]) {
+  if ([self.window respondsToSelector:@selector(performWindowDragWithEvent:)]) {
     // According to Google, using performWindowDragWithEvent:
     // does not generate a NSWindowWillMoveNotification. Hence post one.
     [[NSNotificationCenter defaultCenter]
         postNotificationName:NSWindowWillMoveNotification
                       object:self];
 
-    if (@available(macOS 10.11, *)) {
-      [self.window performWindowDragWithEvent:event];
-    }
+    [self.window performWindowDragWithEvent:event];
+
     return;
   }
 
@@ -106,7 +106,7 @@ - (void)mouseDown:(NSEvent*)event {
 }
 
 - (void)mouseDragged:(NSEvent*)event {
-  if ([self.window respondsToSelector:@selector(performWindowDragWithEvent)]) {
+  if ([self.window respondsToSelector:@selector(performWindowDragWithEvent:)]) {
     return;
   }