From 603d765ca5154db27718d89a2ee9be2a95a64254 Mon Sep 17 00:00:00 2001
From: Alexander Dunaev <adunaev@igalia.com>
Date: Fri, 29 Oct 2021 20:54:46 +0700
Subject: [PATCH] [linux/xfce] Set zero insets on maximising the window.

It turned out that Xfwm handles the frame insets not the way KWin and
Mutter do.

Bug: 1260821
Change-Id: I69e71049157c03b74d78bc5edb7a60bf39cdda8b
---

diff --git a/ui/platform_window/x11/x11_window.cc b/ui/platform_window/x11/x11_window.cc
index dd381747..706f19c 100644
--- a/ui/platform_window/x11/x11_window.cc
+++ b/ui/platform_window/x11/x11_window.cc
@@ -676,6 +676,13 @@
   // save this one for later too.
   should_maximize_after_map_ = !window_mapped_in_client_;
 
+  // Some WMs keep respecting the frame extents even if the window is maximised.
+  // Remove the insets when maximising.  The extents will be set again when the
+  // window is restored to normal state.
+  // See https://crbug.com/1260821
+  if (CanSetDecorationInsets())
+    SetDecorationInsets(nullptr);
+
   SetWMSpecState(true, x11::GetAtom("_NET_WM_STATE_MAXIMIZED_VERT"),
                  x11::GetAtom("_NET_WM_STATE_MAXIMIZED_HORZ"));
 }