window_type not applied in signal.rstft() and signal.spectrogram()

[LasseBoerresen]

I noticed a bug in signal.rstft(). It does not store the output of apply_window(window, window_type), line 396.

solution is:
line 396: window = apply_window(window, window_type)

Additionally, there is no option on function signal.spectrogram to chose window_type, consequently the default window_type of rstft, 'rect', is used, which gives bad effects on the spectrogram image because of edge effects. Please add the option.

best regards
L. S. Børresen