Code to reproduce memory issue with NavCanvas.NavCanvas and ScaledTextBox

reproduce_canvas_memory_increase.py

import wx
print(wx.version())
import wx.lib
from wx.lib.floatcanvas import NavCanvas
app = wx.App(0)
wx.InitAllImageHandlers()
frame_1 = wx.Frame(None, wx.ID_ANY, "")
app.SetTopWindow(frame_1)


nc = NavCanvas.NavCanvas(frame_1, ProjectionFun=None, BackgroundColor="BLACK")
canvas = nc.Canvas

n_text = canvas.AddScaledTextBox(
    String="test",
    Point=(0, 0),
    Size=10,
    Color="WHITE",
    BackgroundColor="BLACK",
    Family=wx.DEFAULT,
    Style=wx.NORMAL,
    Weight=wx.NORMAL,
    Underlined=False,
    Alignment="center",
    Position="cc")

counter = 1000000
for i in xrange(counter):
    if i % 1000 == 0:
        print("{}/{}".format(i, counter))
    canvas.Draw(Force=True)