Fix closing animation window crash python

.github/workflows/testing-and-deployment.yml

@@ -1,4 +1,4 @@
-name: GH Actions
+name: Actions
 
 # repo specific gh actions
 env:
@@ -29,6 +29,7 @@ jobs:
         run: |
           pip install -r requirements_style.txt --disable-pip-version-check
           make
+
   doc_build:
     name: Build Documentation
     runs-on: ubuntu-latest
@@ -47,13 +48,15 @@ jobs:
           sudo apt-get install libgl1-mesa-glx xvfb
           pip install pyvista
           xvfb-run python -c "import pyvista; print(pyvista.Report())"
+
       - name: Install ansys-mapdl-reader
         run: |
           pip install -r requirements_build.txt --disable-pip-version-check
           python setup.py bdist_wheel
           pip install dist/ansys*.whl --disable-pip-version-check
           cd tests/
           xvfb-run python -c "from ansys.mapdl import reader as pymapdl_reader; print(pymapdl_reader.Report())"
+
       - name: Build Documentation
         run: |
           sudo apt install pandoc -qy
@@ -62,6 +65,7 @@ jobs:
           sudo apt install zip
           cd doc/build/html/
           zip ../../../${{ env.PACKAGE_NAME }}-HTML.zip ./*
+
       - name: Upload
         uses: actions/upload-artifact@v2
         with:
@@ -85,7 +89,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10']
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         os: [ubuntu-latest, windows-latest]
 
     steps:

ansys/mapdl/reader/rst.py

@@ -3,6 +3,7 @@
 Used:
 .../ansys/customize/include/fdresu.inc
 """
+import os
 from collections.abc import Iterable, Sequence
 import time
 import warnings
@@ -2841,7 +2842,16 @@ def q_callback():
                 """exit when user wants to leave"""
                 self._animating = False
 
+            def exit_callback(plotter, RenderWindowInteractor, event):
+                """exit when user wants to leave"""
+                self._animating = False
+                plotter.close()
+
             plotter.add_key_event("q", q_callback)
+            if os.name == 'nt':
+                # Adding closing window callback
+                plotter.iren.add_observer(vtk.vtkCommand.ExitEvent, 
+                                          lambda render, event: exit_callback(plotter, render, event))
 
             first_loop = True
             cached_normals = [None for _ in range(n_frames)]

setup.py

@@ -180,7 +180,7 @@ def compiler_name():
                            language='c++'),
                  ],
 
-    python_requires='>=3.6.*',
+    python_requires='>=3.7.*',
     keywords='vtk MAPDL ANSYS cdb full rst',
     package_data={'ansys.mapdl.reader.examples': ['TetBeam.cdb',
                                                   'HexBeam.cdb',