sudo apt-get install build-essential libgtk2.0-dev

vim ~/.sublime_imfix.c

#include <gtk/gtkimcontext.h>
void gtk_im_context_set_client_window (GtkIMContext *context, GdkWindow *window)
{
    GtkIMContextClass *klass;
    g_return_if_fail (GTK_IS_IM_CONTEXT (context));
    klass = GTK_IM_CONTEXT_GET_CLASS (context);
    if (klass->set_client_window)
        klass->set_client_window (context, window);
    g_object_set_data(G_OBJECT(context),"window",window);
    if(!GDK_IS_WINDOW (window))
        return;
    int width = gdk_window_get_width(window);
    int height = gdk_window_get_height(window);
    if(width != 0 && height !=0)
        gtk_im_context_focus_in(context);
}

cd ~
gcc -shared -o libsublime-imfix.so sublime_imfix.c  `pkg-config --libs --cflags gtk+-2.0` -fPIC

sudo mv libsublime-imfix.so /opt/sublime_text/

sudo vim /usr/bin/subl
#!/bin/sh
LD_PRELOAD=/opt/sublime_text/libsublime-imfix.so exec /opt/sublime_text/sublime_text "$@"

sudo vim /usr/share/applications/sublime_text.desktop
[Desktop Entry]
Version=1.0
Type=Application
Name=Sublime Text
GenericName=Text Editor
Comment=Sophisticated text editor for code, markup and prose
Exec=bash -c "LD_PRELOAD=/opt/sublime_text/libsublime-imfix.so exec /opt/sublime_text/sublime_text %F"
Terminal=false
MimeType=text/plain;
Icon=sublime-text
Categories=TextEditor;Development;
StartupNotify=true
Actions=Window;Document;

[Desktop Action Window]
Name=New Window
Exec=bash -c "LD_PRELOAD=/opt/sublime_text/libsublime-imfix.so exec /opt/sublime_text/sublime_text -n"
OnlyShowIn=Unity;

[Desktop Action Document]
Name=New File
Exec=bash -c "LD_PRELOAD=/opt/sublime_text/libsublime-imfix.so exec /opt/sublime_text/sublime_text --command new_file"
OnlyShowIn=Unity;