[PATCH] allow to force backing store for display

[Jean-Marc Lasgouttes]

This patch allows to enforce the use of of a backing store for display. 
This has no effect for Wayland and macOS, when backing store is always on.

The main use for it is x11 with a window manager theme with translucent 
windows (KDE)
https://www.lyx.org/trac/ticket/12119

At this point, there is no UI for this, because I think this is a niche 
case. I would be open to the idea of adding a checkbox somewhere.

Note that this is candidate for 2.3.x too.

In 2.5.x, the plan is to rewrite painting to be more Qt-like, so that 
this thing will not be necessary anymore.

JMarc
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