On Mac OS X, we currently map "Help" code value to kVK_Help key since "Help" key on Sun keyboard generates the virtual keycode. However, normal PC keyboard which is, of course, more typical than Sun keyboard's insert key causes kVK_Help too. The key was labeled "Help" in old Mac's keyboard. However, in these days, the key has gone and using "Insert" value gives us better compatibility with other OSes (Windows and Linux). Additionally, Chromium uses "Insert" for it. So, this should be changed in our side.
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