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[Bug 875435] Re: iBus indicator does not show on the panel


Hello Gunnar:
For your comment #72:

For SRU justification, think it in this way: This bug is a serious
regression compare to Ubuntu releases in pre-Unity era. And its effect
is blocking. How can we leave it semi-fixed for three releases including
an LTS has 5 year life time?

The of principle im-config or backported im-switch is the following:

/usr/bin/im-launch does two things:
1. Start IM
2. exec $@ (Execute whatever its argument specifies)

/etc/X11/Xsession.d/70im-config_launch or 70im-switch_launch does one thing:
STARTUP="/usr/bin/im-launch $STARTUP" (alter STARTUP variable)

In contract, in origin im-switch, /etc/X11/Xsession.d/80im-switch
directly start IM.

What's the magic of STARTUP variable?
You may issue the following command first:
grep STARTUP /etc/X11/Xsession.d/*
Then you will notice that in several files do something like this:
STARTUP="some_command $STARTUP"
And in /etc/X11/Xsession.d/99x11-common_start, it simply
If all the some_command follows the convention that it does its own job then exec its argument, a reverse sequential order of execution is archived.
That's why im-config or backported im-switch use 70 instead of 80. 
Because dbus-launch uses 75, alter STARTUP variable in 70 can guarantee that IM is started after DBus, which is desired.

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  iBus indicator does not show on the panel

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