xpra: fix #41106

(cherry picked from commit 4459844)

pkgs/tools/X11/xpra/default.nix

@@ -27,6 +27,7 @@ in buildPythonApplication rec {
       inherit (xorg) xkeyboardconfig;
       inherit libfakeXinerama;
     })
+    ./fix-41106.patch
   ];
 
   postPatch = ''

pkgs/tools/X11/xpra/fix-41106.patch

@@ -0,0 +1,15 @@
+diff --git a/xpra/server/server_util.py b/xpra/server/server_util.py
+index 2ff2c0c..513201a 100644
+--- a/xpra/server/server_util.py
++++ b/xpra/server/server_util.py
+@@ -17,6 +17,10 @@ if PYTHON3:
+         return b"'" + s.replace(b"'", b"'\\''") + b"'"
+
+     def xpra_runner_shell_script(xpra_file, starting_dir, socket_dir):
++        # Nixpkgs contortion:
++        # xpra_file points to a shell wrapper, not to the python script.
++        dirname, basename = os.path.split(xpra_file)
++        xpra_file = os.path.join(dirname, "."+basename+"-wrapped")
+         script = []
+         script.append(b"#!/bin/sh\n")
+         for var, value in os.environb.items():