commit fa1d09b1068456b5245070b25b4de48cb3ab1615
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Mon Aug 25 16:23:54 2025 +0200
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Mon Aug 25 16:24:17 2025 +0200

    Fix "Wayland libdecor crashes with built-in one." (#1299)

 src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
index 5cba874..dd7761d 100644
--- src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
+++ src/drivers/Wayland/Fl_Wayland_Window_Driver.cxx
@@ -1734,6 +1734,9 @@ void Fl_Wayland_Window_Driver::fullscreen_on() {
 void Fl_Wayland_Window_Driver::fullscreen_off(int X, int Y, int W, int H) {
   pWindow->hide();
   pWindow->_clear_fullscreen();
+  // avoid being called with W=H=0 in suboptimal scenario of #1299
+  if (!W) W = w();
+  if (!H) H = h();
   pWindow->resize(X, Y, W, H);
   pWindow->show();
   Fl::handle(FL_FULLSCREEN, pWindow);