Editor: Workaround to correctly set background color on Mac

Fixes #2028

spyderlib/widgets/sourcecode/base.py

@@ -242,6 +242,15 @@ def set_palette(self, background, foreground):
         palette.setColor(QPalette.Text, foreground)
         self.setPalette(palette)
 
+        # Set the right background color when changing color schemes
+        # or creating new Editor windows. This seems to be a Qt bug.
+        # Fixes Issue 2028
+        if sys.platform == 'darwin':
+            if self.objectName():
+                style = "QPlainTextEdit#%s {background: %s;}" % \
+                        (self.objectName(), background.name())
+                self.setStyleSheet(style)
+
 
     #------Extra selections
     def get_extra_selections(self, key):

spyderlib/widgets/sourcecode/codeeditor.py

@@ -356,6 +356,19 @@ def __init__(self, parent=None):
         TextEditBaseWidget.__init__(self, parent)
         self.setFocusPolicy(Qt.StrongFocus)
 
+        # We use these object names to set the right background
+        # color when changing color schemes or creating new
+        # Editor windows. This seems to be a Qt bug.
+        # Fixes Issue 2028
+        if sys.platform == 'darwin':
+            plugin_name = repr(parent)
+            if 'editor' in plugin_name.lower():
+                self.setObjectName('editor')
+            elif 'inspector' in plugin_name.lower():
+                self.setObjectName('inspector')
+            elif 'historylog' in plugin_name.lower():
+                self.setObjectName('historylog')
+
         # Completion
         completion_size = CONF.get('editor_appearance', 'completion/size')
         completion_font = get_font('editor')