[Libreoffice-bugs] [Bug 70976] SLIDESHOW: Desktop visible on right side of screen when running slideshow. Thin line.

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=70976

--- Comment #20 from sergio.callegari at gmail.com ---
Issue is still present as of LibO 7.0.2 (seen in Linux, but most likely common
to the other platforms as well).

Unclear to me why marked as "desktop visible on right side of the screen". On
my system, I see a white line on the right side of the screen during
presentation when the slide have a solid background color. My desktop color is
blue. Probably this depends on the platform.

An obvious workaround exist, consisting in not using a solid background color
for the slide, but using a rectangular box filled with the desired background
color placed below all the other elements (this is very easy to achieve using
master pages). If you make the box as large as the slide, you still get the
white line on the right, but if you make the box just a bit larger than the
slide, then the white line is no more present. For instance, if the slide is
280x157.5mm, with the background box as large as 280mm you get the white line,
while setting it to 280.02mm you don't see it anymore.

This suggests a rounding error somewhere, or pixels being counted from 0 in one
place and from 1 in another (so you get off by 1 pixel). But this is just an
hypothesis and the issue may well be completely different.

With respect to the time when the bug was first reported (LibO 4.1.x, Autumn
2013), the problem has probably become more visible due to the fact that many
monitors now have a 16:9 form factor, while there are still a lot of slides
around designed for a 4:3 screen form factor. When you play a 4:3 presentation
on a 16:9 screen, the white line gets inside the screen, not on its border and
thus gets quite visible.

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