wxGUI/wx.metadata: fix lazy import of GRASS GIS wxPy 'core.gcmd', 'gu…

…i_core.forms' module classes (#614)

Fix compilation errors on the OS MS Windows.

src/gui/wxpython/wx.metadata/g.gui.metadata/g.gui.metadata.py

@@ -44,7 +44,6 @@
 from core.debug import Debug
 
 # from datacatalog.tree import LocationMapTree
-from core.utils import GetListOfLocations, ListOfMapsets
 
 grass.utils.set_path(modulename="wx.metadata", dirname="mdlib", path="..")
 
@@ -82,9 +81,10 @@ def __init__(
         super(LocationMapTree, self).__init__(parent, id=wx.ID_ANY, style=style)
 
         try:
-            global RunCommand
+            global GetListOfLocations, ListOfMapsets, RunCommand
 
             from core.gcmd import RunCommand
+            from core.utils import GetListOfLocations, ListOfMapsets
         except ModuleNotFoundError as e:
             msg = e.msg
             sys.exit(

src/gui/wxpython/wx.metadata/mdlib/cswlib.py

@@ -27,8 +27,6 @@
 
 set_gui_path()
 
-from gui_core.forms import GUI
-
 import wx
 import wx.html as html
 from wx import SplitterWindow
@@ -105,7 +103,7 @@ def __init__(self, parent, main, giface=None):
         wx.Panel.__init__(self, parent)
 
         try:
-            global BBox, CatalogueServiceWeb, Environment, ExceptionReport, FileSystemLoader, GError, GMessage, GWarning, HtmlFormatter, PropertyIsLike, XmlLexer, highlight
+            global BBox, CatalogueServiceWeb, Environment, ExceptionReport, FileSystemLoader, GError, GMessage, GUI, GWarning, HtmlFormatter, PropertyIsLike, XmlLexer, highlight
 
             from jinja2 import Environment, FileSystemLoader
 
@@ -118,6 +116,7 @@ def __init__(self, parent, main, giface=None):
             from pygments.lexers import XmlLexer
 
             from core.gcmd import GError, GMessage, GWarning
+            from gui_core.forms import GUI
         except ModuleNotFoundError as e:
             msg = e.msg
             sys.exit(