Set text editor palette colors:
        background color and caret (text cursor) color

def set_palette(self, background, foreground):
        """
        Set text editor palette colors:
        background color and caret (text cursor) color
        """
        palette = QPalette()
        palette.setColor(QPalette.Base, background)
        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 and 8069
        if self.objectName():
            style = "QPlainTextEdit#%s {background: %s; color: %s;}" % \
                    (self.objectName(), background.name(), foreground.name())
            self.setStyleSheet(style)