Bug report

Bug summary

I am using embedded plots in a TKinter application. In theFigureCanvasTkAgg.__init__ method, at the end there is a call to focus_set, stealing focus upon construction of the widget. To make matters worse, focus stealing happens asynchronous.

Code for reproduction

importtkinterastkfrommatplotlib.figureimportFigurefrommatplotlib.backends.backend_tkaggimportFigureCanvasTkAggt=tk.Tk()b1=tk.Button(t,text='My Button')b1.pack(side='top')f=Figure()fc=FigureCanvasTkAgg(f,t)fc.get_tk_widget().pack()# !! after FigureCanvasTkAgg initialization !!b1.focus_set()t.after(500,lambda:print(t.focus_get()))t.mainloop()

Actual outcome

C:\TEMP>python tkagg.py.!canvas

I.e. canvas has focus although button should have it.

Expected outcome

1. Creating a widget of any kind should never steal focus.
2. Using focus_set() afterwards should be able to reset focus.

Matplotlib version

• Operating system: Windows 10
• Matplotlib version: 2.0.2
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: 3.6.2
• Jupyter version (if applicable):
• Other libraries:

Python installed via official installer, matplotlib via pip.

The call tofocus_set is still present in the master version: