Make sure that we won't wrongly match a hotkey after losing and getting focus.

bus/inputcontext.c

Index: bus/inputcontext.c
diff --git a/bus/inputcontext.c b/bus/inputcontext.c
index 936dec16bb8be09060b92a0fcde835c62780dfbc..f63c3aec5a2af9aa8ee429e2fb8606eca44d3f3c 100644
--- a/bus/inputcontext.c
+++ b/bus/inputcontext.c
@@ -1163,6 +1163,11 @@ bus_input_context_focus_in (BusInputContext *context)
 
     context->has_focus = TRUE;
 
+    // To make sure that we won't use an old value left before we losing focus
+    // last time.
+    context->prev_keyval = IBUS_VoidSymbol;
+    context->prev_modifiers = 0;
+
     if (context->engine == NULL && context->enabled) {
         g_signal_emit (context, context_signals[REQUEST_ENGINE], 0, NULL);
     }