Controller mapping fixes

Common/VR/PPSSPPVR.cpp

@@ -254,6 +254,7 @@ void UpdateVRInput(bool haptics, float dp_xscale, float dp_yscale) {
 			keyInput.deviceId = controllerIds[j];
 
 			//process the key action
+
 			if (m.pressed != pressed) {
 				if (pressed && haptics) {
 					INVR_Vibrate(100, j, 1000);
@@ -446,7 +447,8 @@ void UpdateVRInput(bool haptics, float dp_xscale, float dp_yscale) {
 			mousePressed = pressed;
 		}
 
-		//mouse wheel emulation
+		// mouse wheel emulation
+		// TODO: Spams key-up events if nothing changed!
 		for (int j = 0; j < 2; j++) {
 			keyInput.deviceId = controllerIds[j];
 			float scroll = -IN_VRGetJoystickState(j).y;

Core/KeyMap.cpp

@@ -48,14 +48,17 @@ std::set<std::string> g_seenPads;
 std::map<int, std::string> g_padNames;
 std::set<int> g_seenDeviceIds;
 
-// Utility...
+// Utility for UI navigation
 void SingleInputMappingFromPspButton(int btn, std::vector<InputMapping> *mappings, bool ignoreMouse) {
 	std::vector<MultiInputMapping> multiMappings;
 	InputMappingsFromPspButton(btn, &multiMappings, ignoreMouse);
 	mappings->clear();
 	for (auto &mapping : multiMappings) {
-		_dbg_assert_(!mapping.empty());
-		mappings->push_back(mapping.mappings[0]);
+		if (!mapping.empty()) {
+			mappings->push_back(mapping.mappings[0]);
+		} else {
+			WARN_LOG(COMMON, "Encountered empty mapping in multi-mapping for button %d", btn);
+		}
 	}
 }
 
@@ -598,6 +601,11 @@ bool ReplaceSingleKeyMapping(int btn, int index, MultiInputMapping key) {
 			return false;
 		}
 	}
+
+	if (key.empty()) {
+		return false;
+	}
+
 	KeyMap::g_controllerMap[btn][index] = key;
 	g_controllerMapGeneration++;
 
@@ -702,8 +710,10 @@ void LoadFromIni(IniFile &file) {
 
 		for (size_t j = 0; j < mappings.size(); j++) {
 			MultiInputMapping input = MultiInputMapping::FromConfigString(mappings[j]);
+			if (input.empty()) {
+				continue;  // eat empty mappings, however they arose, so they can't keep haunting us.
+			}
 			SetInputMapping(psp_button_names[i].key, input, false);
-
 			for (auto mapping : input.mappings) {
 				g_seenDeviceIds.insert(mapping.deviceId);
 			}

UI/ControlMappingScreen.cpp

@@ -163,6 +163,11 @@ void SingleControlMapper::Refresh() {
 }
 
 void SingleControlMapper::MappedCallback(MultiInputMapping kdf) {
+	if (kdf.empty()) {
+		// Don't want to try to add this.
+		return;
+	}
+
 	switch (action_) {
 	case ADD:
 		KeyMap::SetInputMapping(pspKey_, kdf, false);
@@ -355,6 +360,13 @@ bool KeyMappingNewKeyDialog::key(const KeyInput &key) {
 		}
 	}
 	if (key.flags & KEY_UP) {
+		// If the key released wasn't part of the mapping, ignore it here. Some device can cause
+		// stray key-up events.
+		InputMapping upMapping(key.deviceId, key.keyCode);
+		if (!mapping_.mappings.contains(upMapping)) {
+			return true;
+		}
+
 		if (callback_)
 			callback_(mapping_);
 		TriggerFinish(DR_YES);
@@ -386,7 +398,9 @@ bool KeyMappingNewMouseKeyDialog::key(const KeyInput &key) {
 		}
 
 		mapped_ = true;
+
 		MultiInputMapping kdf(InputMapping(key.deviceId, key.keyCode));
+
 		TriggerFinish(DR_YES);
 		g_Config.bMapMouse = false;
 		if (callback_)