diff --git a/core/io/logger.cpp b/core/io/logger.cpp
index eeb82bfce4a..9175f6a2626 100644
--- a/core/io/logger.cpp
+++ b/core/io/logger.cpp
@@ -39,7 +39,7 @@
 // va_copy, otherwise you have to use the internal version (__va_copy).
 #if !defined(va_copy)
 #if defined(__GNUC__)
-#define va_copy(d, s) __va_copy(d, s)
+#define va_copy(d, s) __va_copy((d), (s))
 #else
 #define va_copy(d, s) ((d) = (s))
 #endif
diff --git a/core/math/geometry.cpp b/core/math/geometry.cpp
index 194a6f63520..a84b5a16c7c 100644
--- a/core/math/geometry.cpp
+++ b/core/math/geometry.cpp
@@ -515,7 +515,7 @@ static inline void _build_faces(uint8_t ***p_cell_status, int x, int y, int z, i
 		Vector3(1,1,1),
 	};
 */
-#define vert(m_idx) Vector3((m_idx & 4) >> 2, (m_idx & 2) >> 1, m_idx & 1)
+#define vert(m_idx) Vector3(((m_idx)&4) >> 2, ((m_idx)&2) >> 1, (m_idx)&1)
 
 	static const uint8_t indices[6][4] = {
 		{ 7, 6, 4, 5 },
diff --git a/core/typedefs.h b/core/typedefs.h
index 03514466c0a..78688ff3113 100644
--- a/core/typedefs.h
+++ b/core/typedefs.h
@@ -137,7 +137,7 @@ T *_nullptr() {
 /** Generic swap template */
 #ifndef SWAP
 
-#define SWAP(m_x, m_y) __swap_tmpl(m_x, m_y)
+#define SWAP(m_x, m_y) __swap_tmpl((m_x), (m_y))
 template <class T>
 inline void __swap_tmpl(T &x, T &y) {
 
diff --git a/editor/code_editor.cpp b/editor/code_editor.cpp
index 7ee4d5b03b6..0b06839ecf0 100644
--- a/editor/code_editor.cpp
+++ b/editor/code_editor.cpp
@@ -1085,6 +1085,79 @@ void CodeTextEditor::clone_lines_down() {
 	text_editor->update();
 }
 
+void CodeTextEditor::toggle_inline_comment(const String &delimiter) {
+	text_editor->begin_complex_operation();
+	if (text_editor->is_selection_active()) {
+		int begin = text_editor->get_selection_from_line();
+		int end = text_editor->get_selection_to_line();
+
+		// End of selection ends on the first column of the last line, ignore it.
+		if (text_editor->get_selection_to_column() == 0)
+			end -= 1;
+
+		int col_to = text_editor->get_selection_to_column();
+		int cursor_pos = text_editor->cursor_get_column();
+
+		// Check if all lines in the selected block are commented
+		bool is_commented = true;
+		for (int i = begin; i <= end; i++) {
+			if (!text_editor->get_line(i).begins_with(delimiter)) {
+				is_commented = false;
+				break;
+			}
+		}
+		for (int i = begin; i <= end; i++) {
+			String line_text = text_editor->get_line(i);
+
+			if (line_text.strip_edges().empty()) {
+				line_text = delimiter;
+			} else {
+				if (is_commented) {
+					line_text = line_text.substr(delimiter.length(), line_text.length());
+				} else {
+					line_text = delimiter + line_text;
+				}
+			}
+			text_editor->set_line(i, line_text);
+		}
+
+		// Adjust selection & cursor position.
+		int offset = (is_commented ? -1 : 1) * delimiter.length();
+		int col_from = text_editor->get_selection_from_column() > 0 ? text_editor->get_selection_from_column() + offset : 0;
+
+		if (is_commented && text_editor->cursor_get_column() == text_editor->get_line(text_editor->cursor_get_line()).length() + 1)
+			cursor_pos += 1;
+
+		if (text_editor->get_selection_to_column() != 0 && col_to != text_editor->get_line(text_editor->get_selection_to_line()).length() + 1)
+			col_to += offset;
+
+		if (text_editor->cursor_get_column() != 0)
+			cursor_pos += offset;
+
+		text_editor->select(begin, col_from, text_editor->get_selection_to_line(), col_to);
+		text_editor->cursor_set_column(cursor_pos);
+
+	} else {
+		int begin = text_editor->cursor_get_line();
+		String line_text = text_editor->get_line(begin);
+		int delimiter_length = delimiter.length();
+
+		int col = text_editor->cursor_get_column();
+		if (line_text.begins_with(delimiter)) {
+			line_text = line_text.substr(delimiter_length, line_text.length());
+			col -= delimiter_length;
+		} else {
+			line_text = delimiter + line_text;
+			col += delimiter_length;
+		}
+
+		text_editor->set_line(begin, line_text);
+		text_editor->cursor_set_column(col);
+	}
+	text_editor->end_complex_operation();
+	text_editor->update();
+}
+
 void CodeTextEditor::goto_line(int p_line) {
 	text_editor->deselect();
 	text_editor->unfold_line(p_line);
diff --git a/editor/code_editor.h b/editor/code_editor.h
index 67e8fc9d3c1..e3dbfe1ce04 100644
--- a/editor/code_editor.h
+++ b/editor/code_editor.h
@@ -211,6 +211,10 @@ public:
 	void delete_lines();
 	void clone_lines_down();
 
+	/// Toggle inline comment on currently selected lines, or on current line if nothing is selected,
+	/// by adding or removing comment delimiter
+	void toggle_inline_comment(const String &delimiter);
+
 	void goto_line(int p_line);
 	void goto_line_selection(int p_line, int p_begin, int p_end);
 
diff --git a/editor/editor_file_dialog.h b/editor/editor_file_dialog.h
index 1b9b5f98128..edaccac51d4 100644
--- a/editor/editor_file_dialog.h
+++ b/editor/editor_file_dialog.h
@@ -124,7 +124,6 @@ private:
 
 	ToolButton *fav_up;
 	ToolButton *fav_down;
-	ToolButton *fav_rm;
 
 	ItemList *favorites;
 	ItemList *recent;
diff --git a/editor/editor_settings.cpp b/editor/editor_settings.cpp
index 8d590e52687..9166db2741b 100644
--- a/editor/editor_settings.cpp
+++ b/editor/editor_settings.cpp
@@ -336,9 +336,9 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	_initial_set("interface/theme/icon_and_font_color", 0);
 	hints["interface/theme/icon_and_font_color"] = PropertyInfo(Variant::INT, "interface/theme/icon_and_font_color", PROPERTY_HINT_ENUM, "Auto,Dark,Light", PROPERTY_USAGE_DEFAULT);
 	_initial_set("interface/theme/base_color", Color::html("#323b4f"));
-	hints["interface/theme/accent_color"] = PropertyInfo(Variant::COLOR, "interface/theme/accent_color", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT);
-	_initial_set("interface/theme/accent_color", Color::html("#699ce8"));
 	hints["interface/theme/base_color"] = PropertyInfo(Variant::COLOR, "interface/theme/base_color", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT);
+	_initial_set("interface/theme/accent_color", Color::html("#699ce8"));
+	hints["interface/theme/accent_color"] = PropertyInfo(Variant::COLOR, "interface/theme/accent_color", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT);
 	_initial_set("interface/theme/contrast", 0.25);
 	hints["interface/theme/contrast"] = PropertyInfo(Variant::REAL, "interface/theme/contrast", PROPERTY_HINT_RANGE, "0.01, 1, 0.01");
 	_initial_set("interface/theme/relationship_line_opacity", 0.1);
diff --git a/editor/plugins/script_editor_plugin.cpp b/editor/plugins/script_editor_plugin.cpp
index e648fa0820c..9e6459e41f1 100644
--- a/editor/plugins/script_editor_plugin.cpp
+++ b/editor/plugins/script_editor_plugin.cpp
@@ -1951,8 +1951,9 @@ bool ScriptEditor::edit(const RES &p_resource, int p_line, int p_col, bool p_gra
 				if (is_visible_in_tree())
 					se->ensure_focus();
 
-				if (p_line >= 0)
+				if (p_line > 0) {
 					se->goto_line(p_line - 1);
+				}
 			}
 			return true;
 		}
@@ -2012,8 +2013,9 @@ bool ScriptEditor::edit(const RES &p_resource, int p_line, int p_col, bool p_gra
 	_test_script_times_on_disk(p_resource);
 	_update_modified_scripts_for_external_editor(p_resource);
 
-	if (p_line >= 0)
+	if (p_line > 0) {
 		se->goto_line(p_line - 1);
+	}
 
 	notify_script_changed(p_resource);
 	_add_recent_script(p_resource->get_path());
diff --git a/editor/plugins/script_text_editor.cpp b/editor/plugins/script_text_editor.cpp
index 554e12f9fd8..8c3f8fd3e84 100644
--- a/editor/plugins/script_text_editor.cpp
+++ b/editor/plugins/script_text_editor.cpp
@@ -796,92 +796,7 @@ void ScriptTextEditor::_edit_option(int p_op) {
 		} break;
 		case EDIT_TOGGLE_COMMENT: {
 
-			Ref<Script> scr = script;
-			if (scr.is_null())
-				return;
-
-			String delimiter = "#";
-			List<String> comment_delimiters;
-			scr->get_language()->get_comment_delimiters(&comment_delimiters);
-
-			for (List<String>::Element *E = comment_delimiters.front(); E; E = E->next()) {
-				String script_delimiter = E->get();
-				if (script_delimiter.find(" ") == -1) {
-					delimiter = script_delimiter;
-					break;
-				}
-			}
-
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				int begin = tx->get_selection_from_line();
-				int end = tx->get_selection_to_line();
-
-				// End of selection ends on the first column of the last line, ignore it.
-				if (tx->get_selection_to_column() == 0)
-					end -= 1;
-
-				int col_to = tx->get_selection_to_column();
-				int cursor_pos = tx->cursor_get_column();
-
-				// Check if all lines in the selected block are commented
-				bool is_commented = true;
-				for (int i = begin; i <= end; i++) {
-					if (!tx->get_line(i).begins_with(delimiter)) {
-						is_commented = false;
-						break;
-					}
-				}
-				for (int i = begin; i <= end; i++) {
-					String line_text = tx->get_line(i);
-
-					if (line_text.strip_edges().empty()) {
-						line_text = delimiter;
-					} else {
-						if (is_commented) {
-							line_text = line_text.substr(delimiter.length(), line_text.length());
-						} else {
-							line_text = delimiter + line_text;
-						}
-					}
-					tx->set_line(i, line_text);
-				}
-
-				// Adjust selection & cursor position.
-				int offset = is_commented ? -1 : 1;
-				int col_from = tx->get_selection_from_column() > 0 ? tx->get_selection_from_column() + offset : 0;
-
-				if (is_commented && tx->cursor_get_column() == tx->get_line(tx->cursor_get_line()).length() + 1)
-					cursor_pos += 1;
-
-				if (tx->get_selection_to_column() != 0 && col_to != tx->get_line(tx->get_selection_to_line()).length() + 1)
-					col_to += offset;
-
-				if (tx->cursor_get_column() != 0)
-					cursor_pos += offset;
-
-				tx->select(begin, col_from, tx->get_selection_to_line(), col_to);
-				tx->cursor_set_column(cursor_pos);
-
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-
-				int col = tx->cursor_get_column();
-				if (line_text.begins_with(delimiter)) {
-					line_text = line_text.substr(delimiter.length(), line_text.length());
-					col -= 1;
-				} else {
-					line_text = delimiter + line_text;
-					col += 1;
-				}
-
-				tx->set_line(begin, line_text);
-				tx->cursor_set_column(col);
-			}
-			tx->end_complex_operation();
-			tx->update();
-
+			_edit_option_toggle_inline_comment();
 		} break;
 		case EDIT_COMPLETE: {
 
@@ -1068,6 +983,25 @@ void ScriptTextEditor::_edit_option(int p_op) {
 	}
 }
 
+void ScriptTextEditor::_edit_option_toggle_inline_comment() {
+	if (script.is_null())
+		return;
+
+	String delimiter = "#";
+	List<String> comment_delimiters;
+	script->get_language()->get_comment_delimiters(&comment_delimiters);
+
+	for (List<String>::Element *E = comment_delimiters.front(); E; E = E->next()) {
+		String script_delimiter = E->get();
+		if (script_delimiter.find(" ") == -1) {
+			delimiter = script_delimiter;
+			break;
+		}
+	}
+
+	code_editor->toggle_inline_comment(delimiter);
+}
+
 void ScriptTextEditor::add_syntax_highlighter(SyntaxHighlighter *p_highlighter) {
 	highlighters[p_highlighter->get_name()] = p_highlighter;
 	highlighter_menu->add_radio_check_item(p_highlighter->get_name());
diff --git a/editor/plugins/script_text_editor.h b/editor/plugins/script_text_editor.h
index f83aadddef9..b081a31c186 100644
--- a/editor/plugins/script_text_editor.h
+++ b/editor/plugins/script_text_editor.h
@@ -136,6 +136,7 @@ protected:
 	void _change_syntax_highlighter(int p_idx);
 
 	void _edit_option(int p_op);
+	void _edit_option_toggle_inline_comment();
 	void _make_context_menu(bool p_selection, bool p_color, bool p_foldable, bool p_open_docs, bool p_goto_definition);
 	void _text_edit_gui_input(const Ref<InputEvent> &ev);
 	void _color_changed(const Color &p_color);
diff --git a/editor/plugins/shader_editor_plugin.cpp b/editor/plugins/shader_editor_plugin.cpp
index 2b6ceac8e2a..d39e5211135 100644
--- a/editor/plugins/shader_editor_plugin.cpp
+++ b/editor/plugins/shader_editor_plugin.cpp
@@ -248,19 +248,19 @@ void ShaderEditor::_menu_option(int p_option) {
 		} break;
 		case EDIT_INDENT_LEFT: {
 
-			TextEdit *tx = shader_editor->get_text_edit();
 			if (shader.is_null())
 				return;
 
+			TextEdit *tx = shader_editor->get_text_edit();
 			tx->indent_left();
 
 		} break;
 		case EDIT_INDENT_RIGHT: {
 
-			TextEdit *tx = shader_editor->get_text_edit();
 			if (shader.is_null())
 				return;
 
+			TextEdit *tx = shader_editor->get_text_edit();
 			tx->indent_right();
 
 		} break;
@@ -272,54 +272,10 @@ void ShaderEditor::_menu_option(int p_option) {
 		} break;
 		case EDIT_TOGGLE_COMMENT: {
 
-			TextEdit *tx = shader_editor->get_text_edit();
 			if (shader.is_null())
 				return;
 
-			tx->begin_complex_operation();
-			if (tx->is_selection_active()) {
-				int begin = tx->get_selection_from_line();
-				int end = tx->get_selection_to_line();
-
-				// End of selection ends on the first column of the last line, ignore it.
-				if (tx->get_selection_to_column() == 0)
-					end -= 1;
-
-				// Check if all lines in the selected block are commented
-				bool is_commented = true;
-				for (int i = begin; i <= end; i++) {
-					if (!tx->get_line(i).begins_with("//")) {
-						is_commented = false;
-						break;
-					}
-				}
-				for (int i = begin; i <= end; i++) {
-					String line_text = tx->get_line(i);
-
-					if (line_text.strip_edges().empty()) {
-						line_text = "//";
-					} else {
-						if (is_commented) {
-							line_text = line_text.substr(2, line_text.length());
-						} else {
-							line_text = "//" + line_text;
-						}
-					}
-					tx->set_line(i, line_text);
-				}
-			} else {
-				int begin = tx->cursor_get_line();
-				String line_text = tx->get_line(begin);
-
-				if (line_text.begins_with("//"))
-					line_text = line_text.substr(2, line_text.length());
-				else
-					line_text = "//" + line_text;
-				tx->set_line(begin, line_text);
-			}
-			tx->end_complex_operation();
-			tx->update();
-			//tx->deselect();
+			shader_editor->toggle_inline_comment("//");
 
 		} break;
 		case EDIT_COMPLETE: {
diff --git a/modules/mono/editor/script_class_parser.cpp b/modules/mono/editor/script_class_parser.cpp
index 6b2ec5cc20a..dfb652a7aa6 100644
--- a/modules/mono/editor/script_class_parser.cpp
+++ b/modules/mono/editor/script_class_parser.cpp
@@ -266,6 +266,20 @@ Error ScriptClassParser::_skip_generic_type_params() {
 
 		if (tk == TK_IDENTIFIER) {
 			tk = get_token();
+			// Type specifications can end with "?" to denote nullable types, such as IList<int?>
+			if (tk == TK_SYMBOL) {
+				tk = get_token();
+				if (value.operator String() != "?") {
+					error_str = "Expected " + get_token_name(TK_IDENTIFIER) + ", found unexpected symbol '" + value + "'";
+					error = true;
+					return ERR_PARSE_ERROR;
+				}
+				if (tk != TK_OP_GREATER && tk != TK_COMMA) {
+					error_str = "Nullable type symbol '?' is only allowed after an identifier, but found " + get_token_name(tk) + " next.";
+					error = true;
+					return ERR_PARSE_ERROR;
+				}
+			}
 
 			if (tk == TK_PERIOD) {
 				while (true) {
diff --git a/modules/mono/utils/mono_reg_utils.cpp b/modules/mono/utils/mono_reg_utils.cpp
index 0eb4b3b8b31..d7f9b22c315 100644
--- a/modules/mono/utils/mono_reg_utils.cpp
+++ b/modules/mono/utils/mono_reg_utils.cpp
@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "mono_reg_utils.h"
+#include "core/os/dir_access.h"
 
 #ifdef WINDOWS_ENABLED
 
@@ -200,6 +201,13 @@ String find_msbuild_tools_path() {
 						val += "\\";
 					}
 
+					// Since VS2019, the directory is simply named "Current"
+					String msBuildDirectory = val + "MSBuild\\Current\\Bin";
+					if (DirAccess::exists(msBuildDirectory)) {
+						return msBuildDirectory;
+					}
+
+					// Directory name "15.0" is used in VS 2017
 					return val + "MSBuild\\15.0\\Bin";
 				}
 			}
diff --git a/scene/2d/physics_body_2d.cpp b/scene/2d/physics_body_2d.cpp
index 1b7e1a6b8b2..690f1d4b4a5 100644
--- a/scene/2d/physics_body_2d.cpp
+++ b/scene/2d/physics_body_2d.cpp
@@ -199,7 +199,7 @@ real_t StaticBody2D::get_constant_angular_velocity() const {
 #ifndef DISABLE_DEPRECATED
 void StaticBody2D::set_friction(real_t p_friction) {
 
-	if (p_friction == 1.0) { // default value, don't create an override for that
+	if (p_friction == 1.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -229,7 +229,7 @@ real_t StaticBody2D::get_friction() const {
 
 void StaticBody2D::set_bounce(real_t p_bounce) {
 
-	if (p_bounce == 0.0) { // default value, don't create an override for that
+	if (p_bounce == 0.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -626,7 +626,7 @@ real_t RigidBody2D::get_weight() const {
 #ifndef DISABLE_DEPRECATED
 void RigidBody2D::set_friction(real_t p_friction) {
 
-	if (p_friction == 1.0) { // default value, don't create an override for that
+	if (p_friction == 1.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}
 
@@ -655,7 +655,7 @@ real_t RigidBody2D::get_friction() const {
 
 void RigidBody2D::set_bounce(real_t p_bounce) {
 
-	if (p_bounce == 0.0) { // default value, don't create an override for that
+	if (p_bounce == 0.0 && physics_material_override.is_null()) { // default value, don't create an override for that
 		return;
 	}