Marcus Nilsson eb97617ff0 PDFViewer: Add actions to rotate the displayed PDF ...

This implements the rotate cw/ccw actions in PDFViewer.
Since the rendered pages are stored in a HashMap for caching,
the bitmap is wrapped in a struct with the current rotation.
This way the caching works as expected while zooming, and a new bitmap
is rendered when the page is rotated.

2022-01-06 21:25:02 +01:00

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