Bug 1083514

Its not doing that here, its carefully right aligned to the screen. Is that a dual-head setup ?

I initially noticed this on a dual-head setup where I had LibreOffice maximized on one screen and then the tool-tip spilled over onto the other screen. Which didn't look good at all.
 But curiously enough, the screenshot I took was from a single screen where it does looks good most of the time. My laptop had previously been connected to a beamer some time earlier though, so it's possible the single-head case is related to the dual-head one.

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Still an issue in libreoffice-5.0.3.2-11.fc23.x86_64 on F23.
To clarify, this can probably only be seen on a dual-head setup. If you put impress on the left screen, the tool-tip will extend over to the right screen.

I have high hopes that with F24 and the new gtk3 vclplug with native gtk3 tooltips that this sort of stuff "just works" now.

With F24, libreoffice-5.1.3.2-7.fc24.x86_64 on gtk3-3.20.6-1.fc24.x86_64, this issue is gone for running LibreOffice with x11 Gdk backend.

When running LibreOffice with wayland Gdk backend, this issue is still present.

with our gtk3 backend we now just tell gtk where the thing that needs a tooltip is and let gtk place the tooltip however gtk pleases, so LibreOffice is mostly out of the loop with respect to positioning.

gtk is positioning the tooltip nicely to stay inside the monitor under X as hoped for. However under wayland we're then suffering from https://bugzilla.gnome.org/show_bug.cgi?id=754716 which is a new phenomenon related to wayland.

The original problem specific to LibreOffice is solved, so I'm going to close this as fixed, but a problem just like it exists under wayland for all gtk3-using applications, but that's out of my hands