So, I'm not familiar with Nux, the GUI toolkit that Unity uses.
unity/src/PanelTray.cpp has these tantalizing lines of code:
void
PanelTray::Draw (nux::GraphicsEngine& gfx_content, bool force_draw)
{
nux::Geometry geo = GetGeometry ();
if (geo.x != _last_x || geo.y != _last_y)
{
_last_x = geo.x;
_last_y = geo.y;
gtk_window_move (GTK_WINDOW (_window), geo.x + PADDING, geo.y);
}
}
It appears to me that geo contains coordinates relative to the parent
widget (which is the panel), while _window is a top-level window and
wants absolute screen coordinates, and therefore this works only when
the panel is at +0+0. If only I knew how to convert relative
coordinates to absolute ones in Nux...
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https://bugs.launchpad.net/bugs/778256
Title:
Notification area ("system tray") missing when using dual monitors of
different sizes, with their bottoms aligned
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