Add a todo for fallback DPI scale detection

src/wrapper/vst3/view.rs

@@ -457,6 +457,13 @@ impl<P: Vst3Plugin> IPlugView for WrapperView<P> {
 
 impl<P: Vst3Plugin> IPlugViewContentScaleSupport for WrapperView<P> {
     unsafe fn set_scale_factor(&self, factor: f32) -> tresult {
+        // TODO: So apparently Ableton Live doesn't call this function. Right now we'll hardcode the
+        //       default scale to 1.0 on Linux and Windows since we can't easily get the scale from
+        //       baseview. A better alternative would be to do the fallback DPI scale detection
+        //       within NIH-plug itself. Then we can still only use baseview's system scale policy
+        //       on macOS and both the editor implementation and the wrappers would know about the
+        //       correct scale.
+
         // On macOS scaling is done by the OS, and all window sizes are in logical pixels
         if cfg!(target_os = "macos") {
             nih_debug_assert_failure!("Ignoring host request to set explicit DPI scaling factor");