Automatically enable and disable "Force Rasterization" when required
Okular implements various print scaling options that require the use of the "Force rasterization" feature or else they have no effect. However this is not communicated in the UI anywhere or handled automatically, leading to users being confused and frustrated when the print scaling option they chose didn't work. It wastes paper too.
This commit causes the "Force rasterization" checkbox to become checked automatically whenever the user selects a print scaling option that requires it, and unchecked if they return to the default scaling mode that does not require it.
BUG: 434247 FIXED-IN: 21.08.2