Fix 2D Pan Tool

editor/plugins/canvas_item_editor_plugin.cpp

@@ -1117,6 +1117,7 @@ bool CanvasItemEditor::_gui_input_rulers_and_guides(const Ref<InputEvent> &p_eve
 }
 
 bool CanvasItemEditor::_gui_input_zoom_or_pan(const Ref<InputEvent> &p_event, bool p_already_accepted) {
+	panner->set_force_drag(tool == TOOL_PAN);
 	bool panner_active = panner->gui_input(p_event, warped_panning ? viewport->get_global_rect() : Rect2());
 	if (panner->is_panning() != pan_pressed) {
 		pan_pressed = panner->is_panning();

scene/gui/view_panner.cpp

@@ -81,7 +81,12 @@ bool ViewPanner::gui_input(const Ref<InputEvent> &p_event, Rect2 p_canvas_rect)
 			return false;
 		}
 
-		if (mb->get_button_index() == MouseButton::MIDDLE || (enable_rmb && mb->get_button_index() == MouseButton::RIGHT) || (!simple_panning_enabled && mb->get_button_index() == MouseButton::LEFT && is_panning())) {
+		bool is_drag_event = mb->get_button_index() == MouseButton::MIDDLE ||
+				(enable_rmb && mb->get_button_index() == MouseButton::RIGHT) ||
+				(!simple_panning_enabled && mb->get_button_index() == MouseButton::LEFT && is_panning()) ||
+				(force_drag && mb->get_button_index() == MouseButton::LEFT);
+
+		if (is_drag_event) {
 			if (mb->is_pressed()) {
 				is_dragging = true;
 			} else {
@@ -166,6 +171,10 @@ bool ViewPanner::is_panning() const {
 	return is_dragging || pan_key_pressed;
 }
 
+void ViewPanner::set_force_drag(bool p_force) {
+	force_drag = p_force;
+}
+
 ViewPanner::ViewPanner() {
 	Array inputs;
 	inputs.append(InputEventKey::create_reference(Key::SPACE));

scene/gui/view_panner.h

@@ -48,6 +48,8 @@ public:
 private:
 	bool is_dragging = false;
 	bool pan_key_pressed = false;
+	bool force_drag = false;
+
 	bool enable_rmb = false;
 	bool simple_panning_enabled = false;
 
@@ -70,6 +72,7 @@ public:
 	void setup(ControlScheme p_scheme, Ref<Shortcut> p_shortcut, bool p_simple_panning);
 
 	bool is_panning() const;
+	void set_force_drag(bool p_force);
 
 	bool gui_input(const Ref<InputEvent> &p_ev, Rect2 p_canvas_rect = Rect2());
 	void release_pan_key();