From 74bed658e13493f0ebfb6f442478fbdaae28f77f Mon Sep 17 00:00:00 2001
From: Luflosi <luflosi@luflosi.de>
Date: Sat, 4 Jan 2020 19:22:25 +0100
Subject: [PATCH] X11: Fix no window position events during resize

From upstream: https://github.com/glfw/glfw/commit/fe57e3c2921a1901390534e1e51053df70b5644b.
---
 glfw/x11_platform.h |  1 +
 glfw/x11_window.c   | 44 +++++++++++++++++++++++++++++++++-----------
 2 files changed, 34 insertions(+), 11 deletions(-)

diff --git a/glfw/x11_platform.h b/glfw/x11_platform.h
index eb5e576c1..806e125e5 100644
--- a/glfw/x11_platform.h
+++ b/glfw/x11_platform.h
@@ -180,6 +180,7 @@ typedef struct _GLFWwindowX11
 {
     Colormap        colormap;
     Window          handle;
+    Window          parent;
 
     bool            iconified;
     bool            maximized;
diff --git a/glfw/x11_window.c b/glfw/x11_window.c
index b3c0cd785..b0e408ff7 100644
--- a/glfw/x11_window.c
+++ b/glfw/x11_window.c
@@ -1184,6 +1184,18 @@ static void processEvent(XEvent *event)
 
     switch (event->type)
     {
+        case CreateNotify:
+        {
+            window->x11.parent = event->xcreatewindow.parent;
+            return;
+        }
+
+        case ReparentNotify:
+        {
+            window->x11.parent = event->xreparent.parent;
+            return;
+        }
+
         case KeyPress:
         {
             UPDATE_KEYMAP_IF_NEEDED;
@@ -1377,18 +1389,28 @@ static void processEvent(XEvent *event)
                 window->x11.height = event->xconfigure.height;
             }
 
-            if (event->xconfigure.x != window->x11.xpos ||
-                event->xconfigure.y != window->x11.ypos)
-            {
-                if (event->xany.send_event)
-                {
-                    _glfwInputWindowPos(window,
-                                        event->xconfigure.x,
-                                        event->xconfigure.y);
+            int xpos = event->xconfigure.x;
+            int ypos = event->xconfigure.y;
 
-                    window->x11.xpos = event->xconfigure.x;
-                    window->x11.ypos = event->xconfigure.y;
-                }
+            // NOTE: ConfigureNotify events from the server are in local
+            //       coordinates, so if we are reparented we need to translate
+            //       the position into root (screen) coordinates
+            if (!event->xany.send_event && window->x11.parent != _glfw.x11.root)
+            {
+                Window dummy;
+                XTranslateCoordinates(_glfw.x11.display,
+                                      window->x11.parent,
+                                      _glfw.x11.root,
+                                      xpos, ypos,
+                                      &xpos, &ypos,
+                                      &dummy);
+            }
+
+            if (xpos != window->x11.xpos || ypos != window->x11.ypos)
+            {
+                _glfwInputWindowPos(window, xpos, ypos);
+                window->x11.xpos = xpos;
+                window->x11.ypos = ypos;
             }
 
             return;