prusa-slicer: allow wayland (#417751)

commit c9282b73f3d09daff23a2603addd94605596ebe7

Author: Robert Schiele <rschiele@gmail.com>

Date:   Thu May 8 19:16:46 2025 +0200

    remove forcing GDK_BACKEND to x11

    It seems the problems on Wayland from the past are removed meanwhile.

diff --git a/src/CLI/GuiParams.cpp b/src/CLI/GuiParams.cpp

index f44b91651f..41b42ff368 100644

--- a/src/CLI/GuiParams.cpp

+++ b/src/CLI/GuiParams.cpp

@@ -107,9 +107,8 @@ int start_gui_with_params(GUI::GUI_InitParams& params)

 #if !defined(_WIN32) && !defined(__APPLE__)

     // likely some linux / unix system

     const char* display = boost::nowide::getenv("DISPLAY");

-    // const char *wayland_display = boost::nowide::getenv("WAYLAND_DISPLAY");

-    //if (! ((display && *display) || (wayland_display && *wayland_display))) {

-    if (!(display && *display)) {

+    const char *wayland_display = boost::nowide::getenv("WAYLAND_DISPLAY");

+    if (! ((display && *display) || (wayland_display && *wayland_display))) {

         // DISPLAY not set.

         boost::nowide::cerr << "DISPLAY not set, GUI mode not available." << std::endl << std::endl;

         print_help(false);

@@ -141,4 +140,4 @@ int start_as_gcode_viewer(GUI::GUI_InitParams& gui_params)

 }

 #else // SLIC3R_GUI

     // If there is no GUI, we shall ignore the parameters. Remove them from the list.

-#endif // SLIC3R_GUI

\ No newline at end of file

+#endif // SLIC3R_GUI

diff --git a/src/CLI/Setup.cpp b/src/CLI/Setup.cpp

index 82e03d466d..95acdf3477 100644

--- a/src/CLI/Setup.cpp

+++ b/src/CLI/Setup.cpp

@@ -212,11 +212,6 @@ static bool setup_common()

     save_main_thread_id();

 #ifdef __WXGTK__

-    // On Linux, wxGTK has no support for Wayland, and the app crashes on

-    // startup if gtk3 is used. This env var has to be set explicitly to

-    // instruct the window manager to fall back to X server mode.

-    ::setenv("GDK_BACKEND", "x11", /* replace */ true);

-

     // https://github.com/prusa3d/PrusaSlicer/issues/12969

     ::setenv("WEBKIT_DISABLE_COMPOSITING_MODE", "1", /* replace */ false);

     ::setenv("WEBKIT_DISABLE_DMABUF_RENDERER", "1", /* replace */ false);

@@ -338,4 +333,4 @@ bool setup(Data& cli, int argc, char** argv)

     return true;

 }

-}

\ No newline at end of file

+}

    rev = "version_${finalAttrs.version}";

  };

  # only applies to prusa slicer because super-slicer overrides *all* patches

  patches = [

    # https://github.com/NixOS/nixpkgs/issues/415703

    # https://gitlab.archlinux.org/archlinux/packaging/packages/prusa-slicer/-/merge_requests/5

    ./allow_wayland.patch

  ];

  # (not applicable to super-slicer fork)

  postPatch = lib.optionalString (finalAttrs.pname == "prusa-slicer") (

    # Patch required for GCC 14, but breaks on clang