problem with wayland and icon for the QApp

docs/content/warnings.rst

@@ -34,8 +34,9 @@ Library Issues
 
 .. important::
     The **plotting code** is probably sensitive to the environment (platform and version of the libraries).
-    Therefore, these dependencies are minimized and insulated from the rest of the code.
+    Particularly, using the Wayland display system (instead of X11) is creating several issues.
     The plotting code (viewer and plotter) is separated from the simulation code (mesher and solver).
+    Hence, these graphical dependencies are minimized and insulated from the rest of the code.
 
 .. important::
     **Jupyter** is not included in the default package dependencies.

pypeec/lib_plot/manage_plotgui.py

@@ -76,6 +76,11 @@ def __init__(self, plot_mode, folder, name):
             # create and assign a single instance
             APPQT = qtpy.QtWidgets.QApplication([])
 
+            # set the icon
+            filename = importlib.resources.files("pypeec.data").joinpath("pypeec.png")
+            res_icon = qtpy.QtGui.QIcon(str(filename))
+            APPQT.setWindowIcon(res_icon)
+
         # set the app ID in order to get a consistent icon on MS Windows
         if (self.plot_mode == "qt") and (os.name == "nt"):
             ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID("pypeec")