Merge 9ae058b208 into 9352d8fe93

The previous implementation was based on the incorrect assumption that
the _NET_WM_STATE_ABOVE state is always retained on unmapped windows.
According to EWMH the WM should remove the _NET_WM_STATE property when
a window is unmapped.

This commit moves the adding of _NET_WM_STATE_ABOVE to before mapping
the window during glfwShowWindow.  The logic for removing
_NET_WM_STATE_ABOVE from hidden windows is retained, as EWMH still
allows WMs to leave the window property on unmapped window.

Fixes #2276

README.md

@@ -153,6 +153,7 @@ information on what to include when reporting a bug.
  - [X11] Bugfix: Prevent BadWindow when creating small windows with a content scale
    less than 1 (#2754)
  - [X11] Bugfix: Clamp width and height to >= 1 to prevent BadValue error and app exit
+ - [X11] Bugfix: Floating windows silently became non-floating when hidden (#2276)
  - [Linux] Bugfix: The header for `ioctl` was only implicitly included (#2778)
  - [Null] Added Vulkan 'window' surface creation via `VK_EXT_headless_surface`
  - [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`

src/linux_joystick.c

@@ -51,7 +51,7 @@
 static void handleKeyEvent(_GLFWjoystick* js, int code, int value)
 {
     _glfwInputJoystickButton(js,
-                             js->linjs.keyMap[code - BTN_MISC],
+                             js->linjs.keyMap[code],
                              value ? GLFW_PRESS : GLFW_RELEASE);
 }
 
@@ -191,12 +191,28 @@ static GLFWbool openJoystickDevice(const char* path)
 
     int axisCount = 0, buttonCount = 0, hatCount = 0;
 
-    for (int code = BTN_MISC;  code < KEY_CNT;  code++)
+    // This loop should stop at KEY_CNT instead of KEY_MAX. However, we are
+    // terminating the loop one iteration early to maintain compatibility with
+    // the SDL gamepad mappings.
+    for (int code = BTN_JOYSTICK;  code < KEY_MAX;  code++)
     {
         if (!isBitSet(code, keyBits))
             continue;
 
-        linjs.keyMap[code - BTN_MISC] = buttonCount;
+        linjs.keyMap[code] = buttonCount;
+        buttonCount++;
+    }
+
+    // Originally, this range was not mapped, but some controllers now output
+    // these values. Appending them to the end of the list maintains both
+    // backwards compatibility with older versions of GLFW, and with the SDL
+    // gamepad mappings.
+    for (int code = 0;  code < BTN_JOYSTICK;  code++)
+    {
+        if (!isBitSet(code, keyBits))
+            continue;
+
+        linjs.keyMap[code] = buttonCount;
         buttonCount++;
     }
 

src/linux_joystick.h

@@ -37,7 +37,7 @@ typedef struct _GLFWjoystickLinux
 {
     int                     fd;
     char                    path[PATH_MAX];
-    int                     keyMap[KEY_CNT - BTN_MISC];
+    int                     keyMap[KEY_CNT];
     int                     absMap[ABS_CNT];
     struct input_absinfo    absInfo[ABS_CNT];
     int                     hats[4][2];

src/x11_window.c

@@ -2438,6 +2438,38 @@ void _glfwShowWindowX11(_GLFWwindow* window)
     if (_glfwWindowVisibleX11(window))
         return;
 
+    if (window->floating && _glfw.x11.NET_WM_STATE && _glfw.x11.NET_WM_STATE_ABOVE)
+    {
+        Atom* states = NULL;
+        const unsigned long count =
+            _glfwGetWindowPropertyX11(window->x11.handle,
+                                      _glfw.x11.NET_WM_STATE,
+                                      XA_ATOM, (unsigned char**) &states);
+
+        // NOTE: We don't check for failure as this property may not exist yet
+        //       and that's fine (and we'll create it implicitly with append)
+
+        unsigned long i;
+
+        for (i = 0;  i < count;  i++)
+        {
+            if (states[i] == _glfw.x11.NET_WM_STATE_ABOVE)
+                break;
+        }
+
+        if (i == count)
+        {
+            XChangeProperty(_glfw.x11.display, window->x11.handle,
+                            _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
+                            PropModeAppend,
+                            (unsigned char*) &_glfw.x11.NET_WM_STATE_ABOVE,
+                            1);
+        }
+
+        if (states)
+            XFree(states);
+    }
+
     XMapWindow(_glfw.x11.display, window->x11.handle);
     waitForVisibilityNotify(window);
 }
@@ -2667,6 +2699,10 @@ void _glfwSetWindowFloatingX11(_GLFWwindow* window, GLFWbool enabled)
     }
     else
     {
+        // NOTE: _NET_WM_STATE_ABOVE is added when the window is shown
+        if (enabled)
+            return;
+
         Atom* states = NULL;
         const unsigned long count =
             _glfwGetWindowPropertyX11(window->x11.handle,
@@ -2677,8 +2713,6 @@ void _glfwSetWindowFloatingX11(_GLFWwindow* window, GLFWbool enabled)
         // NOTE: We don't check for failure as this property may not exist yet
         //       and that's fine (and we'll create it implicitly with append)
 
-        if (enabled)
-        {
         unsigned long i;
 
         for (i = 0;  i < count;  i++)
@@ -2687,28 +2721,12 @@ void _glfwSetWindowFloatingX11(_GLFWwindow* window, GLFWbool enabled)
                 break;
         }
 
-            if (i == count)
-            {
-                XChangeProperty(_glfw.x11.display, window->x11.handle,
-                                _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
-                                PropModeAppend,
-                                (unsigned char*) &_glfw.x11.NET_WM_STATE_ABOVE,
-                                1);
-            }
-        }
-        else if (states)
-        {
-            for (unsigned long i = 0;  i < count;  i++)
-            {
-                if (states[i] == _glfw.x11.NET_WM_STATE_ABOVE)
+        if (i < count)
         {
             states[i] = states[count - 1];
             XChangeProperty(_glfw.x11.display, window->x11.handle,
                             _glfw.x11.NET_WM_STATE, XA_ATOM, 32,
                             PropModeReplace, (unsigned char*) states, count - 1);
-                    break;
-                }
-            }
         }
 
         if (states)