Style: Enforce separation line between function definitions

I couldn't find a tool that enforces it, so I went the manual route:
```
find -name "thirdparty" -prune \
  -o -name "*.cpp" -o -name "*.h" -o -name "*.m" -o -name "*.mm" \
  -o -name "*.glsl" > files
perl -0777 -pi -e 's/\n}\n([^#])/\n}\n\n\1/g' $(cat files)
misc/scripts/fix_style.sh -c
```

This adds a newline after all `}` on the first column, unless they
are followed by `#` (typically `#endif`). This leads to having lots
of places with two lines between function/class definitions, but
clang-format then fixes it as we enforce max one line of separation.

This doesn't fix potential occurrences of function definitions which
are indented (e.g. for a helper class defined in a .cpp), but it's
better than nothing. Also can't be made to run easily on CI/hooks so
we'll have to be careful with new code.

Part of #33027.

15 files changed, 35 insertions, 0 deletions

diff --git a/core/math/aabb.cpp b/core/math/aabb.cpp
index 588ee84f58..d9cb928944 100644
--- a/core/math/aabb.cpp
+++ b/core/math/aabb.cpp
@@ -39,6 +39,7 @@ real_t AABB::get_area() const {
 bool AABB::operator==(const AABB &p_rval) const {
 	return ((position == p_rval.position) && (size == p_rval.size));
 }
+
 bool AABB::operator!=(const AABB &p_rval) const {
 	return ((position != p_rval.position) || (size != p_rval.size));
 }
@@ -238,6 +239,7 @@ Vector3 AABB::get_longest_axis() const {
 
 	return axis;
 }
+
 int AABB::get_longest_axis_index() const {
 	int axis = 0;
 	real_t max_size = size.x;
@@ -269,6 +271,7 @@ Vector3 AABB::get_shortest_axis() const {
 
 	return axis;
 }
+
 int AABB::get_shortest_axis_index() const {
 	int axis = 0;
 	real_t max_size = size.x;
@@ -290,11 +293,13 @@ AABB AABB::merge(const AABB &p_with) const {
 	aabb.merge_with(p_with);
 	return aabb;
 }
+
 AABB AABB::expand(const Vector3 &p_vector) const {
 	AABB aabb = *this;
 	aabb.expand_to(p_vector);
 	return aabb;
 }
+
 AABB AABB::grow(real_t p_by) const {
 	AABB aabb = *this;
 	aabb.grow_by(p_by);
diff --git a/core/math/basis.cpp b/core/math/basis.cpp
index e6bf6110f7..9981b673ed 100644
--- a/core/math/basis.cpp
+++ b/core/math/basis.cpp
@@ -327,6 +327,7 @@ void Basis::rotate_local(const Vector3 &p_axis, real_t p_phi) {
 	// M -> (M.R.Minv).M = M.R.
 	*this = rotated_local(p_axis, p_phi);
 }
+
 Basis Basis::rotated_local(const Vector3 &p_axis, real_t p_phi) const {
 	return (*this) * Basis(p_axis, p_phi);
 }
diff --git a/core/math/camera_matrix.cpp b/core/math/camera_matrix.cpp
index 4b147bd987..c7a3918fe5 100644
--- a/core/math/camera_matrix.cpp
+++ b/core/math/camera_matrix.cpp
@@ -238,6 +238,7 @@ real_t CameraMatrix::get_z_far() const {
 
 	return new_plane.d;
 }
+
 real_t CameraMatrix::get_z_near() const {
 	const real_t *matrix = (const real_t *)this->matrix;
 	Plane new_plane = Plane(matrix[3] + matrix[2],
diff --git a/core/math/geometry.cpp b/core/math/geometry.cpp
index 3085997225..f1676ec152 100644
--- a/core/math/geometry.cpp
+++ b/core/math/geometry.cpp
@@ -51,6 +51,7 @@ bool Geometry::is_point_in_polygon(const Vector2 &p_point, const Vector<Vector2>
 	}
 	return false;
 }
+
 */
 
 void Geometry::MeshData::optimize_vertices() {
diff --git a/core/math/octree.h b/core/math/octree.h
index 0782a39804..067103112d 100644
--- a/core/math/octree.h
+++ b/core/math/octree.h
@@ -1218,6 +1218,7 @@ void Octree<T, use_pairs, AL>::set_pair_callback(PairCallback p_callback, void *
 	pair_callback = p_callback;
 	pair_callback_userdata = p_userdata;
 }
+
 template <class T, bool use_pairs, class AL>
 void Octree<T, use_pairs, AL>::set_unpair_callback(UnpairCallback p_callback, void *p_userdata) {
 	unpair_callback = p_callback;
diff --git a/core/math/transform.cpp b/core/math/transform.cpp
index 0f62c8b2c0..0274dd18af 100644
--- a/core/math/transform.cpp
+++ b/core/math/transform.cpp
@@ -145,6 +145,7 @@ void Transform::scale_basis(const Vector3 &p_scale) {
 void Transform::translate(real_t p_tx, real_t p_ty, real_t p_tz) {
 	translate(Vector3(p_tx, p_ty, p_tz));
 }
+
 void Transform::translate(const Vector3 &p_translation) {
 	for (int i = 0; i < 3; i++) {
 		origin[i] += basis[i].dot(p_translation);
@@ -174,6 +175,7 @@ bool Transform::is_equal_approx(const Transform &p_transform) const {
 bool Transform::operator==(const Transform &p_transform) const {
 	return (basis == p_transform.basis && origin == p_transform.origin);
 }
+
 bool Transform::operator!=(const Transform &p_transform) const {
 	return (basis != p_transform.basis || origin != p_transform.origin);
 }
diff --git a/core/math/transform.h b/core/math/transform.h
index 7f7e9ce833..71847d36ac 100644
--- a/core/math/transform.h
+++ b/core/math/transform.h
@@ -117,6 +117,7 @@ _FORCE_INLINE_ Vector3 Transform::xform(const Vector3 &p_vector) const {
 			basis[1].dot(p_vector) + origin.y,
 			basis[2].dot(p_vector) + origin.z);
 }
+
 _FORCE_INLINE_ Vector3 Transform::xform_inv(const Vector3 &p_vector) const {
 	Vector3 v = p_vector - origin;
 
@@ -138,6 +139,7 @@ _FORCE_INLINE_ Plane Transform::xform(const Plane &p_plane) const {
 
 	return Plane(normal, d);
 }
+
 _FORCE_INLINE_ Plane Transform::xform_inv(const Plane &p_plane) const {
 	Vector3 point = p_plane.normal * p_plane.d;
 	Vector3 point_dir = point + p_plane.normal;
diff --git a/core/math/transform_2d.cpp b/core/math/transform_2d.cpp
index f82d1d99c4..eecfc862f5 100644
--- a/core/math/transform_2d.cpp
+++ b/core/math/transform_2d.cpp
@@ -123,15 +123,18 @@ void Transform2D::scale(const Size2 &p_scale) {
 	scale_basis(p_scale);
 	elements[2] *= p_scale;
 }
+
 void Transform2D::scale_basis(const Size2 &p_scale) {
 	elements[0][0] *= p_scale.x;
 	elements[0][1] *= p_scale.y;
 	elements[1][0] *= p_scale.x;
 	elements[1][1] *= p_scale.y;
 }
+
 void Transform2D::translate(real_t p_tx, real_t p_ty) {
 	translate(Vector2(p_tx, p_ty));
 }
+
 void Transform2D::translate(const Vector2 &p_translation) {
 	elements[2] += basis_xform(p_translation);
 }
diff --git a/core/math/transform_2d.h b/core/math/transform_2d.h
index 66958257d7..46e97abaa7 100644
--- a/core/math/transform_2d.h
+++ b/core/math/transform_2d.h
@@ -153,6 +153,7 @@ Vector2 Transform2D::xform(const Vector2 &p_vec) const {
 				   tdoty(p_vec)) +
 		   elements[2];
 }
+
 Vector2 Transform2D::xform_inv(const Vector2 &p_vec) const {
 	Vector2 v = p_vec - elements[2];
 
@@ -160,6 +161,7 @@ Vector2 Transform2D::xform_inv(const Vector2 &p_vec) const {
 			elements[0].dot(v),
 			elements[1].dot(v));
 }
+
 Rect2 Transform2D::xform(const Rect2 &p_rect) const {
 	Vector2 x = elements[0] * p_rect.size.x;
 	Vector2 y = elements[1] * p_rect.size.y;
diff --git a/core/math/vector2.cpp b/core/math/vector2.cpp
index d06f64b40b..7f264ce119 100644
--- a/core/math/vector2.cpp
+++ b/core/math/vector2.cpp
@@ -192,13 +192,16 @@ bool Vector2::is_equal_approx(const Vector2 &p_v) const {
 Vector2i Vector2i::operator+(const Vector2i &p_v) const {
 	return Vector2i(x + p_v.x, y + p_v.y);
 }
+
 void Vector2i::operator+=(const Vector2i &p_v) {
 	x += p_v.x;
 	y += p_v.y;
 }
+
 Vector2i Vector2i::operator-(const Vector2i &p_v) const {
 	return Vector2i(x - p_v.x, y - p_v.y);
 }
+
 void Vector2i::operator-=(const Vector2i &p_v) {
 	x -= p_v.x;
 	y -= p_v.y;
@@ -236,6 +239,7 @@ Vector2i Vector2i::operator-() const {
 bool Vector2i::operator==(const Vector2i &p_vec2) const {
 	return x == p_vec2.x && y == p_vec2.y;
 }
+
 bool Vector2i::operator!=(const Vector2i &p_vec2) const {
 	return x != p_vec2.x || y != p_vec2.y;
 }
diff --git a/core/math/vector2.h b/core/math/vector2.h
index 5aa40d45f7..e5774f1d55 100644
--- a/core/math/vector2.h
+++ b/core/math/vector2.h
@@ -157,13 +157,16 @@ _FORCE_INLINE_ Vector2 operator*(real_t p_scalar, const Vector2 &p_vec) {
 _FORCE_INLINE_ Vector2 Vector2::operator+(const Vector2 &p_v) const {
 	return Vector2(x + p_v.x, y + p_v.y);
 }
+
 _FORCE_INLINE_ void Vector2::operator+=(const Vector2 &p_v) {
 	x += p_v.x;
 	y += p_v.y;
 }
+
 _FORCE_INLINE_ Vector2 Vector2::operator-(const Vector2 &p_v) const {
 	return Vector2(x - p_v.x, y - p_v.y);
 }
+
 _FORCE_INLINE_ void Vector2::operator-=(const Vector2 &p_v) {
 	x -= p_v.x;
 	y -= p_v.y;
@@ -201,6 +204,7 @@ _FORCE_INLINE_ Vector2 Vector2::operator-() const {
 _FORCE_INLINE_ bool Vector2::operator==(const Vector2 &p_vec2) const {
 	return x == p_vec2.x && y == p_vec2.y;
 }
+
 _FORCE_INLINE_ bool Vector2::operator!=(const Vector2 &p_vec2) const {
 	return x != p_vec2.x || y != p_vec2.y;
 }
diff --git a/core/math/vector3.cpp b/core/math/vector3.cpp
index 8acbe31f35..4a9b251406 100644
--- a/core/math/vector3.cpp
+++ b/core/math/vector3.cpp
@@ -46,6 +46,7 @@ void Vector3::set_axis(int p_axis, real_t p_value) {
 	ERR_FAIL_INDEX(p_axis, 3);
 	coord[p_axis] = p_value;
 }
+
 real_t Vector3::get_axis(int p_axis) const {
 	ERR_FAIL_INDEX_V(p_axis, 3, 0);
 	return operator[](p_axis);
@@ -54,6 +55,7 @@ real_t Vector3::get_axis(int p_axis) const {
 int Vector3::min_axis() const {
 	return x < y ? (x < z ? 0 : 2) : (y < z ? 1 : 2);
 }
+
 int Vector3::max_axis() const {
 	return x < y ? (y < z ? 2 : 1) : (x < z ? 2 : 0);
 }
@@ -63,6 +65,7 @@ void Vector3::snap(Vector3 p_val) {
 	y = Math::stepify(y, p_val.y);
 	z = Math::stepify(z, p_val.z);
 }
+
 Vector3 Vector3::snapped(Vector3 p_val) const {
 	Vector3 v = *this;
 	v.snap(p_val);
diff --git a/core/math/vector3.h b/core/math/vector3.h
index 5fc412628f..3e35a5bba2 100644
--- a/core/math/vector3.h
+++ b/core/math/vector3.h
@@ -256,6 +256,7 @@ Vector3 &Vector3::operator-=(const Vector3 &p_v) {
 	z -= p_v.z;
 	return *this;
 }
+
 Vector3 Vector3::operator-(const Vector3 &p_v) const {
 	return Vector3(x - p_v.x, y - p_v.y, z - p_v.z);
 }
@@ -266,6 +267,7 @@ Vector3 &Vector3::operator*=(const Vector3 &p_v) {
 	z *= p_v.z;
 	return *this;
 }
+
 Vector3 Vector3::operator*(const Vector3 &p_v) const {
 	return Vector3(x * p_v.x, y * p_v.y, z * p_v.z);
 }
diff --git a/core/math/vector3i.cpp b/core/math/vector3i.cpp
index e621d5493a..718a1553a0 100644
--- a/core/math/vector3i.cpp
+++ b/core/math/vector3i.cpp
@@ -34,6 +34,7 @@ void Vector3i::set_axis(int p_axis, int32_t p_value) {
 	ERR_FAIL_INDEX(p_axis, 3);
 	coord[p_axis] = p_value;
 }
+
 int32_t Vector3i::get_axis(int p_axis) const {
 	ERR_FAIL_INDEX_V(p_axis, 3, 0);
 	return operator[](p_axis);
@@ -42,6 +43,7 @@ int32_t Vector3i::get_axis(int p_axis) const {
 int Vector3i::min_axis() const {
 	return x < y ? (x < z ? 0 : 2) : (y < z ? 1 : 2);
 }
+
 int Vector3i::max_axis() const {
 	return x < y ? (y < z ? 2 : 1) : (x < z ? 2 : 0);
 }
diff --git a/core/math/vector3i.h b/core/math/vector3i.h
index 5ecd3228b2..524f45b452 100644
--- a/core/math/vector3i.h
+++ b/core/math/vector3i.h
@@ -132,6 +132,7 @@ Vector3i &Vector3i::operator-=(const Vector3i &p_v) {
 	z -= p_v.z;
 	return *this;
 }
+
 Vector3i Vector3i::operator-(const Vector3i &p_v) const {
 	return Vector3i(x - p_v.x, y - p_v.y, z - p_v.z);
 }
@@ -142,6 +143,7 @@ Vector3i &Vector3i::operator*=(const Vector3i &p_v) {
 	z *= p_v.z;
 	return *this;
 }
+
 Vector3i Vector3i::operator*(const Vector3i &p_v) const {
 	return Vector3i(x * p_v.x, y * p_v.y, z * p_v.z);
 }