Make EditorSpinSlider display a slider for floats with a step of 1.0

Integers still don't display a slider (and use up/down arrows instead),
so that they can be quickly distinguished from floats in the inspector.

However, this now makes floats with a step of 1.0 look different
from integers in the inspector.

doc/classes/EditorSpinSlider.xml

@@ -10,6 +10,9 @@
 	<tutorials>
 	</tutorials>
 	<members>
+		<member name="editing_integer" type="bool" setter="set_editing_integer" getter="is_editing_integer" default="false">
+			If [code]true[/code], the [EditorSpinSlider] is considered to be editing an integer value. If [code]false[/code], the [EditorSpinSlider] is considered to be editing a floating-point value. This is used to determine whether a slider should be drawn. The slider is only drawn for floats; integers use up-down arrows similar to [SpinBox] instead.
+		</member>
 		<member name="flat" type="bool" setter="set_flat" getter="is_flat" default="false">
 			If [code]true[/code], the slider will not draw background.
 		</member>

editor/editor_properties.cpp

@@ -1343,6 +1343,7 @@ void EditorPropertyInteger::setup(int64_t p_min, int64_t p_max, int64_t p_step,
 EditorPropertyInteger::EditorPropertyInteger() {
 	spin = memnew(EditorSpinSlider);
 	spin->set_flat(true);
+	spin->set_editing_integer(true);
 	add_child(spin);
 	add_focusable(spin);
 	spin->connect(SceneStringName(value_changed), callable_mp(this, &EditorPropertyInteger::_value_changed));

editor/gui/editor_spin_slider.cpp

@@ -376,7 +376,7 @@ void EditorSpinSlider::_draw_spin_slider() {
 	TS->free_rid(num_rid);
 
 	if (!hide_slider) {
-		if (get_step() == 1) {
+		if (editing_integer) {
 			Ref<Texture2D> updown2 = read_only ? theme_cache.updown_disabled_icon : theme_cache.updown_icon;
 			int updown_vofs = (size.height - updown2->get_height()) / 2;
 			if (rtl) {
@@ -530,6 +530,19 @@ bool EditorSpinSlider::is_hiding_slider() const {
 	return hide_slider;
 }
 
+void EditorSpinSlider::set_editing_integer(bool p_editing_integer) {
+	if (p_editing_integer == editing_integer) {
+		return;
+	}
+
+	editing_integer = p_editing_integer;
+	queue_redraw();
+}
+
+bool EditorSpinSlider::is_editing_integer() const {
+	return editing_integer;
+}
+
 void EditorSpinSlider::set_label(const String &p_label) {
 	label = p_label;
 	queue_redraw();
@@ -689,11 +702,15 @@ void EditorSpinSlider::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_hide_slider", "hide_slider"), &EditorSpinSlider::set_hide_slider);
 	ClassDB::bind_method(D_METHOD("is_hiding_slider"), &EditorSpinSlider::is_hiding_slider);
 
+	ClassDB::bind_method(D_METHOD("set_editing_integer", "editing_integer"), &EditorSpinSlider::set_editing_integer);
+	ClassDB::bind_method(D_METHOD("is_editing_integer"), &EditorSpinSlider::is_editing_integer);
+
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "label"), "set_label", "get_label");
 	ADD_PROPERTY(PropertyInfo(Variant::STRING, "suffix"), "set_suffix", "get_suffix");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "read_only"), "set_read_only", "is_read_only");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "flat"), "set_flat", "is_flat");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "hide_slider"), "set_hide_slider", "is_hiding_slider");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "editing_integer"), "set_editing_integer", "is_editing_integer");
 
 	ADD_SIGNAL(MethodInfo("grabbed"));
 	ADD_SIGNAL(MethodInfo("ungrabbed"));

editor/gui/editor_spin_slider.h

@@ -71,6 +71,7 @@ class EditorSpinSlider : public Range {
 
 	bool hide_slider = false;
 	bool flat = false;
+	bool editing_integer = false;
 
 	void _grab_start();
 	void _grab_end();
@@ -113,6 +114,9 @@ public:
 	void set_hide_slider(bool p_hide);
 	bool is_hiding_slider() const;
 
+	void set_editing_integer(bool p_editing_integer);
+	bool is_editing_integer() const;
+
 	void set_read_only(bool p_enable);
 	bool is_read_only() const;