Input method does not work in the Unity Dash

# PROBLEM DESCRIPTION

Input method does not work in the Unity Dash.

Currently, my input method defined in ~/.xinputrc is xim. The files reads:

run_im xim

This allows me to keep a custom mapping of Compose sequences in ~/.XCompose. It works everywhere inside the graphical environment, except in the Unity dash/Launcher, where keyboard sequences behave like in a standard installation (i.e., without defining xim as input method).

# EXPECTED BEHAVIOR

I should be able to use my compose sequences defined in ~/.XCompose . For example, one of the sequences is:

<dead_acute> <c> : "ç" ccedilla # LATIN SMALL LETTER C WITH CEDILLA

However, in the dash I get a ć (c-acute). See screenshot provided.

# CURRENT BEHAVIOR

None of my compose sequences in ~/.XCompose work. This problem happens 100% of the time.

# COMMAND OUTPUT

david@zurg:~$ lsb_release -rd
Description: Ubuntu 15.04
Release: 15.04
david@zurg:~$ apt-cache policy unity
unity:
  Installed: 7.3.2+15.04.20150420-0ubuntu1
  Candidate: 7.3.2+15.04.20150420-0ubuntu1
  Version table:
 *** 7.3.2+15.04.20150420-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status