Wayland: fix GL thread races, reconnect ordering and sizing bugs

- GL swaps on a rendering thread no longer touch frame callbacks or
  presentation feedback. They set a per-surface flag and wake the loop; the
  owner thread arms both at its next flush and commits, so the frame callback
  fires without waiting for the application's next swap.
- Clear the offline flag only after the reconnect rebuild succeeds, and not
  when the connection was lost again during it.
- make_current fails with ENOTCONN for a window without a context. Detaching
  is a no-op when nothing is current or the EGL display is gone.
- Window move, resize, window menu and drag start need a pointer button or
  tablet tip that is still held; otherwise they fail with ESTALE and use that
  press's serial. Popups fail with ESTALE without an input serial and with
  ENOTCONN while the display is lost.
- An oversized device size shrinks to the buffer limits, keeping the aspect
  ratio, instead of closing the window.
- FIXED_SIZE windows pin xdg min and max on every set_size. The 64px minimum
  applies only to compositor-suggested sizes, not to application sizes.
- The keyboard-enter serial becomes the input serial. Clipboard copy with no
  keyboard focus fails with ESTALE.
- Relative-pointer windows relock after a reconnect rebuild.
- errno: EBUSY for an active drag, ENOTSUP for place_under_pointer and for GL
  without EGL, EINVAL for drag carry without a drag.
- Default window title and app ID are "YASL".
- Pointer motion and button events carry unrounded device-pixel positions in
  precise_x/precise_y with precise_position set.

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/src/platform/wayland/popup.c b/src/platform/wayland/popup.c
index 1ae4805..f66e155 100644
--- a/src/platform/wayland/popup.c
+++ b/src/platform/wayland/popup.c
@@ -136,9 +136,18 @@ struct wayland_surface *wayland_surface_create_popup(struct wayland_surface *par
 {
     struct wayland_display *c = parent ? parent->conn : NULL;
     struct seat *seat = c ? (c->active_seat ? c->active_seat : c->seats) : NULL;
-    if (!c || c->lost || parent->closed || !parent->xdg_surface || !seat ||
-        !seat->input_serial || !popup_spec_valid(parent, spec))
+    if (!c || !parent->xdg_surface || parent->closed || !popup_spec_valid(parent, spec)) {
+        errno = EINVAL;
         return NULL;
+    }
+    if (c->lost) {
+        errno = ENOTCONN;
+        return NULL;
+    }
+    if (!seat || !seat->input_serial) {
+        errno = ESTALE;
+        return NULL;
+    }
 
     struct wayland_surface *w = calloc(1, sizeof(*w));
     if (!w)