Wayland: Fix cursor offset when shape changes

The Wayland protocol spec[1] states that set_cursor must be called
with the serial number of the enter event.  However, GLFW is passing in
the serial number of the latest received event, which does not meet the
protocol spec.

[1] https://wayland.freedesktop.org/docs/html/apa.html#protocol-spec-wl_pointer

As a result, set_cursor calls were simply ignored by the compositor.

This fix complies with the protocol more closely by specifically caching
the enter event serial, and using it for all set_cursor calls.

Fixes #1706
Closes #1899

(cherry picked from commit e7758c506d)

README.md

@@ -128,6 +128,7 @@ information on what to include when reporting a bug.
    related events were emitted
  - [X11] Bugfix: Changing `GLFW_FLOATING` could leak memory
  - [Wayland] Bugfix: Some keys were not repeating in Wayland (#1908)
+ - [Wayland] Bugfix: Non-arrow cursors are offset from the hotspot (#1706,#1899)
  - [NSGL] Bugfix: Defining `GL_SILENCE_DEPRECATION` externally caused
    a duplicate definition warning (#1840)
  - [EGL] Bugfix: The `GLFW_DOUBLEBUFFER` context attribute was ignored (#1843)
@@ -170,6 +171,7 @@ skills.
  - Denis Bernard
  - Doug Binks
  - blanco
+ - Waris Boonyasiriwat
  - Kyle Brenneman
  - Rok Breulj
  - Kai Burjack
@@ -178,6 +180,7 @@ skills.
  - David Carlier
  - Arturo Castro
  - Chi-kwan Chan
+ - Joseph Chua
  - Ian Clarkson
  - Michał Cichoń
  - Lambert Clara
@@ -349,7 +352,6 @@ skills.
  - Torsten Walluhn
  - Patrick Walton
  - Xo Wang
- - Waris
  - Jay Weisskopf
  - Frank Wille
  - Richard A. Wilkes

src/wl_init.c

@@ -104,6 +104,7 @@ static void pointerHandleEnter(void* data,
 
     window->wl.decorations.focus = focus;
     _glfw.wl.serial = serial;
+    _glfw.wl.pointerEnterSerial = serial;
     _glfw.wl.pointerFocus = window;
 
     window->wl.hovered = GLFW_TRUE;
@@ -163,7 +164,7 @@ static void setCursor(_GLFWwindow* window, const char* name)
     buffer = wl_cursor_image_get_buffer(image);
     if (!buffer)
         return;
-    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.serial,
+    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.pointerEnterSerial,
                           surface,
                           image->hotspot_x / scale,
                           image->hotspot_y / scale);

src/wl_platform.h

@@ -252,6 +252,7 @@ typedef struct _GLFWlibraryWayland
     const char*                 cursorPreviousName;
     int                         cursorTimerfd;
     uint32_t                    serial;
+    uint32_t                    pointerEnterSerial;
 
     int32_t                     keyboardRepeatRate;
     int32_t                     keyboardRepeatDelay;

src/wl_window.c

@@ -796,7 +796,7 @@ static void setCursorImage(_GLFWwindow* window,
         cursorWayland->yhot = image->hotspot_y;
     }
 
-    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.serial,
+    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.pointerEnterSerial,
                           surface,
                           cursorWayland->xhot / scale,
                           cursorWayland->yhot / scale);
@@ -1547,7 +1547,7 @@ static void lockPointer(_GLFWwindow* window)
     window->wl.pointerLock.relativePointer = relativePointer;
     window->wl.pointerLock.lockedPointer = lockedPointer;
 
-    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.serial,
+    wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.pointerEnterSerial,
                           NULL, 0, 0);
 }
 
@@ -1611,7 +1611,7 @@ void _glfwPlatformSetCursor(_GLFWwindow* window, _GLFWcursor* cursor)
     }
     else if (window->cursorMode == GLFW_CURSOR_HIDDEN)
     {
-        wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.serial, NULL, 0, 0);
+        wl_pointer_set_cursor(_glfw.wl.pointer, _glfw.wl.pointerEnterSerial, NULL, 0, 0);
     }
 }