[GRASS5] [bug #3468] (grass) recursive use of r.thin leaves crowded areas

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3468
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Subject: recursive use of r.thin leaves crowded areas

Platform: GNU/Linux/i386
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: grass-6.1.cvs_src_snapshot_2005_05_14

r.thin doesn't find any crowded areas:

r.thin in=rast1 out=rast2
r.thin in=rast2 out=rast3
 File mwin_rast8_thin1 -- 21 rows X 26 columns
 Bounding box:  l = 2, r = 27, t = 2, b = 22
    Path number 1
        Deleted 0  pixels        <--- !!!
 thinning completed successfully.
 Output file 21 rows X 26 columns
 Window 21 rows X 26 columns

but there are still some left:
http://geo4.uibk.ac.at/users/rutzinger/download/thinning_problem.jpg
(this stops for example a vectorisation of the thinned raster)

ascii-raster for reconstructing the problem:
http://geo4.uibk.ac.at/users/rutzinger/download/thin_problem


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