Fix broken circleSquare with newer Gmsh (#794)

* Smooth gmsh meshes to improve orthogonality

* Smooth some more

  More is always better!?

* Smooth a lot

  Windows with Py3k needs a lot of smoothing for circleQuad for some reason

* Enable remote desktop debugging

.appveyor.yml

@@ -7,6 +7,12 @@ image:
 environment:
 
   matrix:
+
+    - TARGET_ARCH: x64
+      CONDA_PY: 36
+      CONDA_INSTALL_LOCN: C:\\Miniconda36-x64
+      FIPY_SOLVERS: scipy
+
     - TARGET_ARCH: x64
       CONDA_PY: 27
       CONDA_INSTALL_LOCN: C:\\Miniconda-x64
@@ -33,11 +39,6 @@ environment:
 #      CONDA_INSTALL_LOCN: C:\\Miniconda36
 #      FIPY_SOLVERS: scipy
 
-    - TARGET_ARCH: x64
-      CONDA_PY: 36
-      CONDA_INSTALL_LOCN: C:\\Miniconda36-x64
-      FIPY_SOLVERS: scipy
-
 matrix:
   exclude:
     - image: Visual Studio 2015
@@ -51,6 +52,11 @@ matrix:
 platform:
     - x64
 
+# Enable remote desktop on CI
+#   https://www.appveyor.com/docs/how-to/rdp-to-build-worker/
+# init:
+#   - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))
+
 install:
     # If there is a newer build queued for the same PR, cancel this one.
     - cmd: |
@@ -77,7 +83,7 @@ install:
 
     # Configure the VM.
     - cmd: if "%TARGET_ARCH%" == "x64" if "%CONDA_PY%" == "27" conda.exe install --quiet --name root python=2.7 fipy
-    - cmd: if "%TARGET_ARCH%" == "x64" if "%CONDA_PY%" == "36" conda.exe install --quiet --name root python>3 fipy gmsh
+    - cmd: if "%TARGET_ARCH%" == "x64" if "%CONDA_PY%" == "36" conda.exe install --quiet --name root "python>3" fipy gmsh
     - cmd: conda.exe remove --quiet --force fipy
     # FIXME: fipy recipe on conda-forge doesn't have gmsh compatible with Python 2.7
     - ps: |
@@ -112,3 +118,7 @@ artifacts:
 
 # deploy_script:
 #     - cmd: upload_or_check_non_existence .\recipe guyer --channel=main
+
+# Hold remote desktop open
+# on_finish:
+#   - ps: $blockRdp = $true; iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/appveyor/ci/master/scripts/enable-rdp.ps1'))

fipy/meshes/gmshMesh.py

@@ -196,7 +196,7 @@ def openMSHFile(name, dimensions=None, coordDimensions=None, communicator=parall
                         # https://gitlab.onelab.info/gmsh/gmsh/issues/733
                         gmshFlags += ["-part_ghosts"]
 
-            gmshFlags += ["-format", "msh2"]
+            gmshFlags += ["-format", "msh2", "-smooth", "8"]
 
             if background is not None:
                 if communicator.procID == 0: