Show a message when trying to zoom farther than the limit

(cherry picked from commit b8f66d58b6d03274788e31cd67f22b9d15c8632c)

editor/plugins/spatial_editor_plugin.cpp

@@ -2220,6 +2220,12 @@ void SpatialEditorViewport::scale_cursor_distance(real_t scale) {
 		cursor.distance = CLAMP(cursor.distance * scale, min_distance, max_distance);
 	}
 
+	if (cursor.distance == max_distance || cursor.distance == min_distance) {
+		zoom_failed_attempts_count++;
+	} else {
+		zoom_failed_attempts_count = 0;
+	}
+
 	zoom_indicator_delay = ZOOM_FREELOOK_INDICATOR_DELAY_S;
 	surface->update();
 }
@@ -2371,6 +2377,7 @@ void SpatialEditorViewport::_notification(int p_what) {
 			zoom_indicator_delay -= delta;
 			if (zoom_indicator_delay <= 0) {
 				surface->update();
+				zoom_limit_label->hide();
 			}
 		}
 
@@ -2732,6 +2739,7 @@ void SpatialEditorViewport::_draw() {
 
 			} else {
 				// Show zoom
+				zoom_limit_label->set_visible(zoom_failed_attempts_count > 15);
 
 				real_t min_distance = MAX(camera->get_znear() * 4, ZOOM_FREELOOK_MIN);
 				real_t max_distance = MIN(camera->get_zfar() / 2, ZOOM_FREELOOK_MAX);
@@ -4004,6 +4012,15 @@ SpatialEditorViewport::SpatialEditorViewport(SpatialEditor *p_spatial_editor, Ed
 	locked_label->set_text(TTR("View Rotation Locked"));
 	locked_label->hide();
 
+	zoom_limit_label = memnew(Label);
+	zoom_limit_label->set_anchors_and_margins_preset(LayoutPreset::PRESET_BOTTOM_LEFT);
+	zoom_limit_label->set_margin(Margin::MARGIN_TOP, -28 * EDSCALE);
+	zoom_limit_label->set_text(TTR("To zoom further, change the camera's clipping planes (View -> Settings...)"));
+	zoom_limit_label->set_name("ZoomLimitMessageLabel");
+	zoom_limit_label->add_color_override("font_color", Color(1, 1, 1, 1));
+	zoom_limit_label->hide();
+	surface->add_child(zoom_limit_label);
+
 	top_right_vbox = memnew(VBoxContainer);
 	top_right_vbox->set_anchors_and_margins_preset(PRESET_TOP_RIGHT, PRESET_MODE_MINSIZE, 2.0 * EDSCALE);
 	top_right_vbox->set_h_grow_direction(GROW_DIRECTION_BEGIN);

editor/plugins/spatial_editor_plugin.h

@@ -272,6 +272,7 @@ private:
 	Label *info_label;
 	Label *cinema_label;
 	Label *locked_label;
+	Label *zoom_limit_label;
 
 	VBoxContainer *top_right_vbox;
 	ViewportRotationControl *rotation_control;
@@ -394,6 +395,7 @@ private:
 	void scale_freelook_speed(real_t scale);
 
 	real_t zoom_indicator_delay;
+	int zoom_failed_attempts_count = 0;
 
 	RID move_gizmo_instance[3], move_plane_gizmo_instance[3], rotate_gizmo_instance[4], scale_gizmo_instance[3], scale_plane_gizmo_instance[3];