Fix of hints arrow for gizmos and hints text

resources/data/hints.ini

@@ -237,14 +237,14 @@ documentation_link = https://help.prusa3d.com/article/prusaslicer-printables-com
 weight = 3
 
 [hint:Cut tool]
-text = Cut tool\nDid you know that you can cut a model at any angle and even create aligning pins with the updated Cut tool? Learn more in the documentation.
+text = Cut tool\nDid you know that you can cut a model at any angle and even create aligning pins with the updated <a>Cut tool</a>? Learn more in the documentation.
 documentation_link = https://help.prusa3d.com/article/cut-tool_1779
 hypertext_type = gizmo
 hypertext_gizmo_item = cut
 weight = 3
 
 [hint:Measurement tool]
-text = Measurement tool\nDid you know that you can measure the distances between points, edges and planes, the radius of a hole or the angle between edges or planes? Learn more in the documentation.
+text = Measurement tool\nDid you know that you can <a>measure</a> the distances between points, edges and planes, the radius of a hole or the angle between edges or planes? Learn more in the documentation.
 documentation_link = https://help.prusa3d.com/article/measurement-tool_399451
 hypertext_type = gizmo
 hypertext_gizmo_item = measure

src/slic3r/GUI/GLCanvas3D.cpp

@@ -7055,7 +7055,7 @@ void GLCanvas3D::GizmoHighlighter::init(GLGizmosManager* manager, GLGizmosManage
 {
     if (m_timer.IsRunning())
         invalidate();
-    if (!gizmo || !canvas)
+    if (gizmo == GLGizmosManager::EType::Undefined || !canvas)
         return;
 
     m_timer.Start(300, false);

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -740,6 +740,7 @@ void GLGizmosManager::render_arrow(const GLCanvas3D& parent, EType highlighted_t
     const float icons_size_x = 2.0f * m_layout.scaled_icons_size() * inv_cnv_w;
     const float icons_size_y = 2.0f * m_layout.scaled_icons_size() * inv_cnv_h;
     const float stride_y = 2.0f * m_layout.scaled_stride_y() * inv_cnv_h;
+    top_y -= stride_y;
 
     for (size_t idx : selectable_idxs) {
         if (idx == highlighted_type) {