diff --git a/lib/Slic3r/Test.pm b/lib/Slic3r/Test.pm
index 570bca41b..8d2a79f2a 100644
--- a/lib/Slic3r/Test.pm
+++ b/lib/Slic3r/Test.pm
@@ -192,12 +192,12 @@ sub init_print {
     if (defined $params{duplicate} && $params{duplicate} > 1) {
         $model->duplicate($params{duplicate} // 1, $config->min_object_distance);
     }
-    $model->arrange_objects($config->min_object_distance);
-    $model->center_instances_around_point($params{print_center} ? Slic3r::Pointf->new(@{$params{print_center}}) : Slic3r::Pointf->new(100,100));
     foreach my $model_object (@{$model->objects}) {
         $model_object->ensure_on_bed;
         $print->auto_assign_extruders($model_object);
     }
+    $model->arrange_objects($config->min_object_distance);
+    $model->center_instances_around_point($params{print_center} ? Slic3r::Pointf->new(@{$params{print_center}}) : Slic3r::Pointf->new(100,100));
 
     $print->apply($model, $config);
     $print->validate;
diff --git a/src/libslic3r/TriangleMesh.cpp b/src/libslic3r/TriangleMesh.cpp
index 8648edc52..fba1429ea 100644
--- a/src/libslic3r/TriangleMesh.cpp
+++ b/src/libslic3r/TriangleMesh.cpp
@@ -914,7 +914,7 @@ void its_collect_mesh_projection_points_above(const indexed_triangle_set &its, c
                 float t = (z - p1.z()) / (p2.z() - p1.z());
                 all_pts.emplace_back(scaled<coord_t>(p1.x() + (p2.x() - p1.x()) * t), scaled<coord_t>(p1.y() + (p2.y() - p1.y()) * t));
             }
-            if (p2.z() > z)
+            if (p2.z() >= z)
                 all_pts.emplace_back(scaled<coord_t>(p2.x()), scaled<coord_t>(p2.y()));
             iprev = iedge;
         }
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index d13daa750..e7daa24ec 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -596,7 +596,7 @@ void GCodeViewer::load(const GCodeProcessor::Result& gcode_result, const Print&
     m_last_result_id = gcode_result.id;
 
     // release gpu memory, if used
-    reset();
+    reset(); 
 
 #if ENABLE_GCODE_WINDOW
     m_sequential_view.gcode_window.set_filename(gcode_result.filename);
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 826342678..1c69683c9 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -4621,6 +4621,14 @@ void GLCanvas3D::_resize(unsigned int w, unsigned int h)
     if (m_canvas == nullptr && m_context == nullptr)
         return;
 
+#if ENABLE_SCROLLABLE_LEGEND
+    const std::array<unsigned int, 2> new_size = { w, h };
+    if (m_old_size == new_size)
+        return;
+
+    m_old_size = new_size;
+#endif // ENABLE_SCROLLABLE_LEGEND
+
     auto *imgui = wxGetApp().imgui();
     imgui->set_display_size(static_cast<float>(w), static_cast<float>(h));
     const float font_size = 1.5f * wxGetApp().em_unit();
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index 9b5c3a911..9b823eae7 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -425,6 +425,10 @@ private:
     Model* m_model;
     BackgroundSlicingProcess *m_process;
 
+#if ENABLE_SCROLLABLE_LEGEND
+    std::array<unsigned int, 2> m_old_size{ 0, 0 };
+#endif // ENABLE_SCROLLABLE_LEGEND
+
     // Screen is only refreshed from the OnIdle handler if it is dirty.
     bool m_dirty;
     bool m_initialized;
@@ -756,6 +760,10 @@ public:
     const Print* fff_print() const;
     const SLAPrint* sla_print() const;
 
+#if ENABLE_SCROLLABLE_LEGEND
+    void reset_old_size() { m_old_size = { 0, 0 }; }
+#endif // ENABLE_SCROLLABLE_LEGEND
+
 private:
     bool _is_shown_on_screen() const;
 
diff --git a/src/slic3r/GUI/NotificationManager.cpp b/src/slic3r/GUI/NotificationManager.cpp
index 1b29b7f76..921f9f2b1 100644
--- a/src/slic3r/GUI/NotificationManager.cpp
+++ b/src/slic3r/GUI/NotificationManager.cpp
@@ -6,6 +6,7 @@
 #include "PrintHostDialogs.hpp"
 #include "wxExtensions.hpp"
 #include "../Utils/PrintHost.hpp"
+#include "libslic3r/Config.hpp"
 
 #include <boost/algorithm/string.hpp>
 #include <boost/log/trivial.hpp>
@@ -304,8 +305,8 @@ void NotificationManager::PopNotification::count_lines()
 	}
 	// hypertext calculation
 	if (!m_hypertext.empty()) {
-		int prev_end = m_endlines.size() > 1 ? m_endlines[m_endlines.size() - 2] : 0;
-		if (ImGui::CalcTextSize((text.substr(prev_end, last_end - prev_end) + m_hypertext).c_str()).x > m_window_width - m_window_width_offset) {
+		int prev_end = m_endlines.size() > 1 ? m_endlines[m_endlines.size() - 2] : 0; // m_endlines.size() - 2 because we are fitting hypertext instead of last endline
+		if (ImGui::CalcTextSize((escape_string_cstyle(text.substr(prev_end, last_end - prev_end)) + m_hypertext).c_str()).x > m_window_width - m_window_width_offset) {
 			m_endlines.push_back(last_end);
 			m_lines_count++;
 		}
@@ -366,7 +367,7 @@ void NotificationManager::PopNotification::render_text(ImGuiWrapper& imgui, cons
 			}
 			//hyperlink text
 			if (!m_hypertext.empty()) {
-				render_hypertext(imgui, x_offset + ImGui::CalcTextSize((line + " ").c_str()).x, starting_y + (m_lines_count - 1) * shift_y, m_hypertext);
+				render_hypertext(imgui, x_offset + ImGui::CalcTextSize((line + (line.empty() ? "" : " ")).c_str()).x, starting_y + (m_lines_count - 1) * shift_y, m_hypertext);
 			}
 			
 			
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 54eddb5e1..45242c593 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3452,8 +3452,12 @@ void Plater::priv::set_current_panel(wxPanel* panel)
 
         // sets the canvas as dirty to force a render at the 1st idle event (wxWidgets IsShownOnScreen() is buggy and cannot be used reliably)
         view3D->set_as_dirty();
+#if ENABLE_SCROLLABLE_LEGEND
+        // reset cached size to force a resize on next call to render() to keep imgui in synch with canvas size
+        view3D->get_canvas3d()->reset_old_size();
+#endif // ENABLE_SCROLLABLE_LEGEND
         view_toolbar.select_item("3D");
-        if(notification_manager != nullptr)
+        if (notification_manager != nullptr)
             notification_manager->set_in_preview(false);
     }
     else if (current_panel == preview) {
@@ -3472,6 +3476,10 @@ void Plater::priv::set_current_panel(wxPanel* panel)
         preview->reload_print(true);
 
         preview->set_as_dirty();
+#if ENABLE_SCROLLABLE_LEGEND
+        // reset cached size to force a resize on next call to render() to keep imgui in synch with canvas size
+        preview->get_canvas3d()->reset_old_size();
+#endif // ENABLE_SCROLLABLE_LEGEND
         view_toolbar.select_item("Preview");
         if (notification_manager != nullptr)
             notification_manager->set_in_preview(true);
diff --git a/tests/libslic3r/test_3mf.cpp b/tests/libslic3r/test_3mf.cpp
index fb41ef93b..d6d3686d9 100644
--- a/tests/libslic3r/test_3mf.cpp
+++ b/tests/libslic3r/test_3mf.cpp
@@ -85,3 +85,43 @@ SCENARIO("Export+Import geometry to/from 3mf file cycle", "[3mf]") {
         }
     }
 }
+
+SCENARIO("2D convex hull of sinking object", "[3mf]") {
+    GIVEN("model") {
+        // load a model
+        Model model;
+        std::string src_file = std::string(TEST_DATA_DIR) + "/test_3mf/Prusa.stl";
+        load_stl(src_file.c_str(), &model);
+        model.add_default_instances();
+
+        WHEN("model is rotated, scaled and set as sinking") {
+            ModelObject* object = model.objects[0];
+            object->center_around_origin(false);
+
+            // set instance's attitude so that it is rotated, scaled and sinking
+            ModelInstance* instance = object->instances[0];
+            instance->set_rotation(Y, -M_PI / 4.0);
+            instance->set_offset(Vec3d::Zero());
+            instance->set_scaling_factor({ 2.0, 2.0, 2.0 });
+
+            // calculate 2D convex hull
+            Polygon hull_2d = object->convex_hull_2d(instance->get_transformation().get_matrix());
+
+            // verify result
+            Points result = {
+                { -4242641, -16299551 },
+                { -4241,    -19502998 },
+                { 66824768, -19502998 },
+                { 66824768, 19502998 },
+                { -4244,    19502998 },
+                { -4242640, -8537523 }
+            };
+            bool res = hull_2d.points == result;
+
+            THEN("2D convex hull should match with reference") {
+                REQUIRE(res);
+            }
+        }
+    }
+}
+