Some coordinates of clipping regions given in device coordinates has to be slightly modified to avoid rounding errors in conversions from device to logical coordinates.
Tests of setting clipping region(s) with wxDC::SetDeviceClippingRegion() for transformed wxDC/wxGCDC (with changed device origin, logical origin and scale and with various renderers for wxGCDC) to check if all transformations are taken into account in the clipping box calculations.
See #17596
In these tests clipping region is set for transformed wxDC/wxGCDC (with changed device origin, logical origin and scale) to check if all these transformations are taken into account in the clipping box calculations.
Flushing native Direct2D renderer (invoking wxGCDC::Flush() -> wxGraphicsContext::Flush() -> ID2D1RenderTarget::Flush()) is apparently not enough to update underlying DC (with selected in bitmap) and therefore we have to destroy the renderer (which in turn invokes ID2D1RenderTarget::EndDraw()) to do so.
1. Added checking if actual drawing output is really clipped at the edge of the clipping box.
2. Added tests for wxGCDC with GDI+, Direct2D, Cairo renderers under wxMSW.
3. Added new test to check calculations for bounding box set entirely outside DC area.
