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diff --git a/src/ui/widget/spin-slider.h b/src/ui/widget/spin-slider.h
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+++ b/src/ui/widget/spin-slider.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Author:
+ *   Nicholas Bishop <nicholasbishop@gmail.com>
+ *
+ * Copyright (C) 2007 Author
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef INKSCAPE_UI_WIDGET_SPIN_SLIDER_H
+#define INKSCAPE_UI_WIDGET_SPIN_SLIDER_H
+
+#include <gtkmm/adjustment.h>
+#include <gtkmm/box.h>
+#include <gtkmm/scale.h>
+#include <gtkmm/togglebutton.h>
+#include "spinbutton.h"
+#include "attr-widget.h"
+
+namespace Inkscape {
+namespace UI {
+namespace Widget {
+
+/**
+ * Groups an HScale and a SpinButton together using the same Adjustment.
+ */
+class SpinSlider : public Gtk::HBox, public AttrWidget
+{
+public:
+    SpinSlider(double value, double lower, double upper, double step_inc,
+	       double climb_rate, int digits, const SPAttributeEnum a = SP_ATTR_INVALID, const char* tip_text = nullptr);
+
+    Glib::ustring get_as_attribute() const override;
+    void set_from_attribute(SPObject*) override;
+
+    // Shortcuts to _adjustment
+    Glib::SignalProxy0<void> signal_value_changed();
+    double get_value() const;
+    void set_value(const double);
+
+    const Gtk::Scale& get_scale() const;
+    Gtk::Scale& get_scale();
+
+    const Inkscape::UI::Widget::SpinButton& get_spin_button() const;
+    Inkscape::UI::Widget::SpinButton& get_spin_button();
+
+    // Change the SpinSlider into a SpinButton with AttrWidget support)
+    void remove_scale();
+private:
+    Glib::RefPtr<Gtk::Adjustment> _adjustment;
+    Gtk::Scale _scale;
+    Inkscape::UI::Widget::SpinButton _spin;
+
+public:
+    const decltype(_adjustment) get_adjustment() const;
+    decltype(_adjustment) get_adjustment();
+};
+
+/**
+ * Contains two SpinSliders for controlling number-opt-number attributes.
+ *
+ * @see SpinSlider
+ */
+class DualSpinSlider : public Gtk::HBox, public AttrWidget
+{
+public:
+    DualSpinSlider(double value, double lower, double upper, double step_inc,
+                   double climb_rate, int digits, const SPAttributeEnum, char* tip_text1, char* tip_text2);
+
+    Glib::ustring get_as_attribute() const override;
+    void set_from_attribute(SPObject*) override;
+
+    sigc::signal<void>& signal_value_changed();
+
+    const SpinSlider& get_spinslider1() const;
+    SpinSlider& get_spinslider1();
+
+    const SpinSlider& get_spinslider2() const;
+    SpinSlider& get_spinslider2();
+
+    void remove_scale();
+private:
+    void link_toggled();
+    void update_linked();
+    sigc::signal<void> _signal_value_changed;
+    SpinSlider _s1, _s2;
+    Gtk::ToggleButton _link;
+};
+
+} // namespace Widget
+} // namespace UI
+} // namespace Inkscape
+
+#endif // INKSCAPE_UI_WIDGET_SPIN_SLIDER_H
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :