by default utilises the color space of the screen on which the window is
located. if a specific value is defined, it will instead be utilised.
depending on the chosen color space the macOS EDR (HDR) support is
activated and that OS's transformation (tone mapping) is used.
Fixes#7341
the unfsContentFrame wasn't updated when externally resized leading to
a wrong unfs window size afterwards. update it on windowDidResize event
when not in fs, not animating and not live resizing.
this broke with the recent refactor of the input handling. one of the
edge cases was not considered, where not every mouse down event has a
corresponding mouse up event, eg all double clicks or more only have one
up event after the first down event.
this was handled correctly previously.
Fixes#13777
move all backend independent code parts in their own folder and files,
to simplify adding new backends. the goal is to only extend one class
and add the backend dependent parts there. usually only the (un)init,
config and related parts need to be implemented per backend. furthermore
all needed windowing and related events are propagated and can be
overwritten. the other backend dependent part is usually the surface for
rendering, for example the opengl oder metal layer.
in the best case a new backend can be added with only a few hundred
lines.
der richter