force x11 backend under wayland

fix #1340
fix #1012
fix #1224
fix #1109

Makefile

@@ -77,7 +77,7 @@ install-guake:
 	# sudo make install
 	@echo "Installing from on your system is not recommended."
 	@echo "Please prefer you application package manager (apt, yum, ...)"
-	@/usr/bin/env python3 -m pip install -r requirements.txt
+	@$(PYTHON_INTERPRETER) -m pip install -r requirements.txt
 
 	@if [ -f guake/paths.py.dev ]; then rm -f guake/paths.py.dev; fi
 	@if [ -f guake/paths.py ]; then mv guake/paths.py guake/paths.py.dev; fi

guake/main.py

@@ -56,6 +56,9 @@ def main():
     # Force to xterm-256 colors for compatibility with some old command line programs
     os.environ["TERM"] = "xterm-256color"
 
+    # Force use X11 backend underwayland
+    os.environ["GDK_BACKEND"] = "x11"
+
     # do not use version keywords here, pbr might be slow to find the version of Guake module
     parser = OptionParser()
     parser.add_option(