5 files changed, 34 insertions, 13 deletions
diff --git a/core/input/input_map.cpp b/core/input/input_map.cpp
index fe4ee99204..816d9d1082 100644
--- a/core/input/input_map.cpp
+++ b/core/input/input_map.cpp
@@ -746,3 +746,7 @@ InputMap::InputMap() {
 	ERR_FAIL_COND_MSG(singleton, "Singleton in InputMap already exist.");
 	singleton = this;
 }
+
+InputMap::~InputMap() {
+	singleton = nullptr;
+}
diff --git a/core/input/input_map.h b/core/input/input_map.h
index a2d3952f94..c724fdb142 100644
--- a/core/input/input_map.h
+++ b/core/input/input_map.h
@@ -95,6 +95,7 @@ public:
 	const OrderedHashMap<String, List<Ref<InputEvent>>> &get_builtins();
 
 	InputMap();
+	~InputMap();
 };
 
 #endif // INPUT_MAP_H
diff --git a/core/math/convex_hull.h b/core/math/convex_hull.h
index a860d60b02..806c6cc3fb 100644
--- a/core/math/convex_hull.h
+++ b/core/math/convex_hull.h
@@ -49,7 +49,7 @@ subject to the following restrictions:
 #include "core/templates/vector.h"
 
 /// Convex hull implementation based on Preparata and Hong
-/// See https://code.google.com/p/bullet/issues/detail?id=275
+/// See https://code.google.com/archive/p/bullet/issues/275
 /// Ole Kniemeyer, MAXON Computer GmbH
 class ConvexHullComputer {
 public:
diff --git a/core/math/dynamic_bvh.h b/core/math/dynamic_bvh.h
index d63132b4da..0b6286cd9d 100644
--- a/core/math/dynamic_bvh.h
+++ b/core/math/dynamic_bvh.h
@@ -41,7 +41,7 @@
 
 /*
 Bullet Continuous Collision Detection and Physics Library
-Copyright (c) 2003-2013 Erwin Coumans  https://bulletphysics.org
+Copyright (c) 2003-2013 Erwin Coumans  http://bulletphysics.org
 
 This software is provided 'as-is', without any express or implied warranty.
 In no event will the authors be held liable for any damages arising from the use of this software.
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index ed6fd13cc8..8416ff929e 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -4329,23 +4329,39 @@ bool String::is_relative_path() const {
 }
 
 String String::get_base_dir() const {
-	int basepos = find(":/");
-	if (basepos == -1) {
-		basepos = find(":\\");
+	int end = 0;
+
+	// url scheme style base
+	int basepos = find("://");
+	if (basepos != -1) {
+		end = basepos + 3;
 	}
+
+	// windows top level directory base
+	if (end == 0) {
+		basepos = find(":/");
+		if (basepos == -1) {
+			basepos = find(":\\");
+		}
+		if (basepos != -1) {
+			end = basepos + 2;
+		}
+	}
+
+	// unix root directory base
+	if (end == 0) {
+		if (begins_with("/")) {
+			end = 1;
+		}
+	}
+
 	String rs;
 	String base;
-	if (basepos != -1) {
-		int end = basepos + 3;
+	if (end != 0) {
 		rs = substr(end, length());
 		base = substr(0, end);
 	} else {
-		if (begins_with("/")) {
-			rs = substr(1, length());
-			base = "/";
-		} else {
-			rs = *this;
-		}
+		rs = *this;
 	}
 
 	int sep = MAX(rs.rfind("/"), rs.rfind("\\"));