Description of problem:
I was typing Chinese text in Gedit with ibus-cangjie.

I typed a bunch of Chinese characters, I had an IBus candidate popup opened, then I used the arrow keys to move the input cursor back a few characters.

Gedit crashed at that point.

Version-Release number of selected component:
gedit-3.16.2-1.fc22

Additional info:
reporter:       libreport-2.6.2
backtrace_rating: 4
cmdline:        /usr/bin/gedit --gapplication-service
crash_function: _gtk_char_segment_new
executable:     /usr/bin/gedit
global_pid:     31186
kernel:         4.1.3-201.fc22.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #4 _gtk_char_segment_new at gtktextsegment.c:195
 #5 char_segment_split_func at gtktextsegment.c:283
 #6 gtk_text_line_segment_split at gtktextsegment.c:127
 #7 gtk_text_btree_link_segment at gtktextbtree.c:6528
 #8 real_set_mark at gtktextbtree.c:2800
 #9 _gtk_text_btree_select_range at gtktextbtree.c:2901
 #10 gtk_text_buffer_select_range at gtktextbuffer.c:2445
 #11 gtk_text_buffer_place_cursor at gtktextbuffer.c:2413
 #12 move_cursor at gtktextview.c:5932
 #13 gtk_text_view_move_cursor at gtktextview.c:6157

Potential duplicate: bug 1010358