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diff --git a/data/ibus.schemas.in b/data/ibus.schemas.in
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index 007fc66..6c75562 100644
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--- a/data/ibus.schemas.in
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+++ b/data/ibus.schemas.in
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@@ -143,7 +143,7 @@ se,si,sk,sy,sy(ku),th,tj,tr,ua,uz,vn
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       <owner>ibus</owner>
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       <type>list</type>
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       <list_type>string</list_type>
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-      <default>[<Super>space]</default>
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+      <default>[<Control>space]</default>
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       <locale name="C">
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         <short>Trigger shortcut keys for gtk_accelerator_parse</short>
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           <long>The shortcut keys for turning input method on or off</long>
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diff --git a/ui/gtk3/panel.vala b/ui/gtk3/panel.vala
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index 54251e7..867dbd2 100644
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--- a/ui/gtk3/panel.vala
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+++ b/ui/gtk3/panel.vala
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@@ -354,6 +354,7 @@ class Panel : IBus.PanelService {
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     }
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     private void update_version_1_5_3() {
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+#if 0
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 #if ENABLE_LIBNOTIFY
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         if (!Notify.is_initted()) {
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             Notify.init ("ibus");
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@@ -374,6 +375,7 @@ class Panel : IBus.PanelService {
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 #else
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         warning(_("Super+space is now the default hotkey."));
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 #endif
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+#endif
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     }
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     private void set_version() {