python - matpltolib navigation toolbar edit curves and parameters line color automatically changes issue -

let's consider axis has multiple lines colors such blue, green, yellow, red, magenta, cyan etc. when user selects curve , presses ok without changing anything, automatically yellow , green colors changed slight difference.

this happens yellow, green colors.

     import sys     import numpy np     matplotlib.figure import figure     import matplotlib     matplotlib.use("qt4agg")     matplotlib.rcparams['backend.qt4']='pyside'     matplotlib.backends.backend_qt4agg import figurecanvasqtagg figurecanvas, navigationtoolbar2qtagg navigationtoolbar     matplotlib.figure import figure     import pyside     pyside import qtgui, qtcore      class myapp(qtgui.qmainwindow):         def __init__(self, parent=none):             qtgui.qmainwindow.__init__(self, parent)              self.widget = qtgui.qwidget()             self.fig = figure((5.0, 4.0), dpi=100)             self.canvas = figurecanvas(self.fig)             self.toolbar = navigationtoolbar(self.canvas, self)              vbox = qtgui.qvboxlayout()             vbox.addwidget(self.canvas)  # matplotlib canvas             vbox.addwidget(self.toolbar)             self.widget.setlayout(vbox)             self.setcentralwidget(self.widget)              self.axes = self.fig.add_subplot(111)             x = np.linspace(-np.pi, np.pi, 256, endpoint=true)             c, s = np.cos(x), np.sin(x)              self.axes.plot(x, c,  linewidth=1.0, linestyle="-", label="cosine")              self.axes.plot(x, s,  linewidth=1.0, linestyle="-", label="sine")             self.axes.legend()             self.canvas.draw()     def main():         app = qtgui.qapplication(sys.argv)         form = myapp()         form.show()         app.exec_()      if __name__ == "__main__":         main() 

now run script , click on edit curves , axes parameters button of toolbar , click ok without changes. can notice green color changing. same happens yellow color also.

thanks, haney.