Return kNotImplemented for the VST3 input events

CHANGELOG.md

@@ -10,6 +10,14 @@ Since there is no stable release yet, the changes are organized per day in
 reverse chronological order. The main purpose of this document in its current
 state is to list breaking changes.
 
+## [2024-03-18]
+
+### Changed
+
+- (Keyboard) input events sent by the host through VST3's `IPlugView` interface
+  are now explicitly ignored. This may allow a couple more keyboard events to
+  reach through to plugin windows in hosts that use these.
+
 ## [2024-02-23]
 
 ### Fixed

src/wrapper/vst3/view.rs

@@ -5,7 +5,7 @@ use std::ffi::{c_void, CStr};
 use std::mem;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
-use vst3_sys::base::{kInvalidArgument, kResultFalse, kResultOk, tresult, TBool};
+use vst3_sys::base::{kInvalidArgument, kNotImplemented, kResultFalse, kResultOk, tresult, TBool};
 use vst3_sys::gui::{IPlugFrame, IPlugView, IPlugViewContentScaleSupport, ViewRect};
 use vst3_sys::utils::SharedVstPtr;
 use vst3_sys::VST3;
@@ -337,7 +337,7 @@ impl<P: Vst3Plugin> IPlugView for WrapperView<P> {
     unsafe fn on_wheel(&self, _distance: f32) -> tresult {
         // We'll let the plugin use the OS' input mechanisms because not all DAWs (or very few
         // actually) implement these functions
-        kResultOk
+        kNotImplemented
     }
 
     unsafe fn on_key_down(
@@ -346,7 +346,7 @@ impl<P: Vst3Plugin> IPlugView for WrapperView<P> {
         _key_code: i16,
         _modifiers: i16,
     ) -> tresult {
-        kResultOk
+        kNotImplemented
     }
 
     unsafe fn on_key_up(
@@ -355,7 +355,7 @@ impl<P: Vst3Plugin> IPlugView for WrapperView<P> {
         _key_code: i16,
         _modifiers: i16,
     ) -> tresult {
-        kResultOk
+        kNotImplemented
     }
 
     unsafe fn get_size(&self, size: *mut ViewRect) -> tresult {
@@ -398,7 +398,7 @@ impl<P: Vst3Plugin> IPlugView for WrapperView<P> {
     }
 
     unsafe fn on_focus(&self, _state: TBool) -> tresult {
-        kResultOk
+        kNotImplemented
     }
 
     unsafe fn set_frame(&self, frame: *mut c_void) -> tresult {