mjhjmtu

I'm trying to configure i3 so that xzoom is always launched in floating mode.

The problem is that xzoom's window does not have a WM_CLASS and its WM_NAME is not set at window creation, but after a small delay.

Here is what the properties look like for the first few ms:

$ xzoom & sleep .01; xprop -id 0x2200001
_NET_WM_DESKTOP(CARDINAL) = 0
WM_STATE(WM_STATE):
 window state: Normal
 icon window: 0x0
WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW
WM_ICON_NAME(STRING) = "xzoom"

As you can see, the only thing that tells it apart is the WM_ICON_NAME.
After a few ms the title is added:

$ xprop
WM_NAME(STRING) = "xzoom x4"
_NET_WM_DESKTOP(CARDINAL) = 0
WM_STATE(WM_STATE):
 window state: Normal
 icon window: 0x0
WM_PROTOCOLS(ATOM): protocols WM_DELETE_WINDOW
WM_ICON_NAME(STRING) = "xzoom"

If I match the window using WM_NAME, the screen flashes horribly, as the other windows are re-arranged before falling back to their positions:

for_window [title="xzoom*"] floating enable

I tried looking for a command criterion that would look at the WM_ICON_NAME, but I couldn't find any.

Is there an alternative way to start this program in floating mode?