First: thanks for your rapid reply.
IceWM 1.4.3.0~pre-20181030-2 is considered very old. This bug had
appeared in v1.6.3 last year. And there has been a fix and no bug with
urxvt v9.22, but v9.26.
For a quick test I've set up jwm (joe's window manager) and I can't
reproduce it. So it is increasingly likely that IceWM is to blame.
$ xwininfo -tree -frame
xwininfo: Window id: 0xe0fe07 "Frame"
Root window id: 0x6d7 (the root window) (has no name)
Parent window id: 0x6d7 (the root window) (has no name)
1 child:
0xe0fe08 "Container": () 484x316+0+0 +100+50
1 child:
0x5a00009 "top": ("rxvt" "URxvt") 484x316+0+0 +100+50
1 child:
0x5a0000e (has no name): () 480x312+2+2 +102+52
And the output after I moved the window a little, and the borders
disappeared, and the transparency got right.
xwininfo: Window id: 0xe0fe07 "Frame"
Root window id: 0x6d7 (the root window) (has no name)
Parent window id: 0x6d7 (the root window) (has no name)
1 child:
0xe0fe08 "Container": () 484x316+0+0 +104+51
1 child:
0x5a00009 "top": ("rxvt" "URxvt") 484x316+0+0 +104+51
1 child:
0x5a0000e (has no name): () 480x312+2+2 +106+53
I've also set up a clean IceWM desktop for a new user, so here are my
experiences:
IceWM 1.4.3.0~pre-20181030 + urxvt 9.22 --> blackborder bug
IceWM 1.4.3.0~pre-20181030 + urxvt 9.26 --> blackborder bug
IceWM 1.6.2 + urxvt 9.22 --> blackborder bug
IceWM 1.6.2 + urxvt 9.26 --> blackborder bug
IceWM 2.1.2 + urxvt 9.22 --> correct
IceWM 2.1.2 + urxvt 9.26 --> blackborder bug
IceWM 2.3.4 + urxvt 9.22 --> correct
IceWM 2.3.4 + urxvt 9.26 --> blackborder bug
IceWM 2.4.0 + urxvt 9.22 --> correct
IceWM 2.4.0 + urxvt 9.26 --> blackborder bug
(IceWM versions 1.6.2 & 2.3.4 came from Debian packages:
https://packages.debian.org/bullseye/icewm - bullseye + experimental)
I'm using Debian sid/experimental on x86-64.
UPDATE!
I've played more with the recent icewm-2.4.0 and urxvt-9.26, and
strange effects has come:
in file ~/.icewm/winoptions
rxvt.URxvt.dBorder: 0 + rxvt -tr --> correct transparency
with title bar
rxvt.URxvt.dBorder: 0 + rxvt -tr -bl --> blackborder +
transparency bug
one more line:
rxvt.URxvt.dTitleBar: 0
rxvt.URxvt.dBorder: 0 + rxvt -tr --> the known bugs
With nothing in ~/.icewm/winoptions + rxvt -bl --> no black borders
with no transparency
So I think IceWM wrongly handle transparency when titlebar is also
hidden.
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