Comment 3 for bug 1383653

scratch still having this problem, japanese input method could also reproduce the same problem, I give hebrew input quick test and it works fine, but I didn't try other input framework but only ibus.

I've also found following workaround works until you switching between windows:
GTK_IM_MODULE=xim scratch-text-editor

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freya: 0.3.1
scratch-text-editor 2.2.1~r1550-0+pkg81~ubuntu0.3.1
ibus 1.5.5-1ubuntu3
ibus-anthy 1.5.4-2 (Japanese)
ibus-chewing 1.4.10.1-1 (Traditional Chinese)