Add `get_dead_zone()` method to `InputMap`

This commit adds a new method to the `InputMap`, allowing the user to get the value of an action's dead zone as a float.

(cherry picked from commit c6f28ed62b5b24033439e6c5d8517883d93c5f53)

core/input_map.cpp

@@ -46,6 +46,7 @@ void InputMap::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("erase_action", "action"), &InputMap::erase_action);
 
 	ClassDB::bind_method(D_METHOD("action_set_deadzone", "action", "deadzone"), &InputMap::action_set_deadzone);
+	ClassDB::bind_method(D_METHOD("action_get_deadzone", "action"), &InputMap::action_get_deadzone);
 	ClassDB::bind_method(D_METHOD("action_add_event", "action", "event"), &InputMap::action_add_event);
 	ClassDB::bind_method(D_METHOD("action_has_event", "action", "event"), &InputMap::action_has_event);
 	ClassDB::bind_method(D_METHOD("action_erase_event", "action", "event"), &InputMap::action_erase_event);
@@ -156,6 +157,12 @@ bool InputMap::has_action(const StringName &p_action) const {
 	return input_map.has(p_action);
 }
 
+float InputMap::action_get_deadzone(const StringName &p_action) {
+	ERR_FAIL_COND_V_MSG(!input_map.has(p_action), 0.0f, _suggest_actions(p_action));
+
+	return input_map[p_action].deadzone;
+}
+
 void InputMap::action_set_deadzone(const StringName &p_action, float p_deadzone) {
 
 	ERR_FAIL_COND_MSG(!input_map.has(p_action), _suggest_actions(p_action));

core/input_map.h

@@ -72,6 +72,7 @@ public:
 	void add_action(const StringName &p_action, float p_deadzone = 0.5);
 	void erase_action(const StringName &p_action);
 
+	float action_get_deadzone(const StringName &p_action);
 	void action_set_deadzone(const StringName &p_action, float p_deadzone);
 	void action_add_event(const StringName &p_action, const Ref<InputEvent> &p_event);
 	bool action_has_event(const StringName &p_action, const Ref<InputEvent> &p_event);

doc/classes/InputMap.xml

@@ -41,6 +41,15 @@
 				Removes all events from an action.
 			</description>
 		</method>
+		<method name="action_get_deadzone">
+			<return type="float">
+			</return>
+			<argument index="0" name="action" type="String">
+			</argument>
+			<description>
+				Returns a deadzone value for the action.
+			</description>
+		</method>
 		<method name="action_has_event">
 			<return type="bool">
 			</return>