imshow bug on GTKCairo and GTK3Cairo #4154
Description
On master, the following code fails (works fine on master with GTK3Agg and with GTK3Cairo on 1.3.1 (debian))
import matplotlib
matplotlib.use('GTK3Cairo')
import matplotlib.pyplot as plt
import numpy as np
data = np.linspace(0, 10, 80).reshape(10, 8)
plt.imshow(data)
plt.show()File "matplotlib/lib/matplotlib/backends/backend_cairo.py", line 169, in in draw_image
buf, cairo.FORMAT_ARGB32, cols, rows, cols*4)
TypeError: Cannot use string as modifiable buffer