[bugreport?] waveform~ 's crop doesn't work when hidden in an patcher/abstraction

Description:
I just did an abstraction to crop buffers with the help of
[waveform~]. But if [waveform~] is hidden, i.e. in a patcher or
abstraction with its window closed, the buffer is cropped but empty
until the object is made visible again.

Expected behavior:
[waveform~]'s crop message should work even if the object is not
visible.

Steps to reproduce:
See the patch. Note that if the [p cropBuffer~] window is opened, then
the example will work.
I even had some crashes sometimes when opning the [p cropBuffer~]
patcher, but they are not reproductible (the crash happened in the
waveform redraw routine)

Max463, OSX52, intel core duo 2.6

Patch:

_____________________________
Patrick Delges

Centre de Recherches et de Formation Musicales de Wallonie asbl
http://www.crfmw.be/max