Fix gizmo being closed after releasing mouse outside the gizmo floating window (#15095)

* Fix gizmo being closed after releasing mouse outside the gizmo floating window

The left up event of a drag started on the gizmo floating window (e.g.
selecting text in an input field) and released over the bed was treated
as a click on the plate, which deselected the objects and closed the
active gizmo. Add the ignore_left_up guard to the plate select branch,
matching the deselect branch above.

Co-Authored-By: Claude <noreply@anthropic.com>

* Fix Emboss gizmo being closed after releasing mouse outside its floating window

The Emboss gizmo has its own close-on-click-away handler
(on_mouse_change_selection) that was not protected against left up events
originating from ImGui windows, so the gizmo was still closed when a drag
started on its floating window (e.g. selecting text in the input field)
ended over the 3D scene. Expose the canvas's ignore_left_up state to
gizmos and skip the close check for such releases.

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/slic3r/GUI/GLCanvas3D.cpp

@@ -4756,7 +4756,9 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
                 deselect_all();
         }
         //BBS Select plate in this 3D canvas.
-        else if (evt.LeftUp() && !m_mouse.dragging && m_picking_enabled && !m_hover_plate_idxs.empty() && (m_canvas_type == CanvasView3D) && !is_layers_editing_enabled())
+        // The left up may come from an ImGui window (e.g. a drag started on the gizmo floating window and released over the bed),
+        // in which case it must not be treated as a click on the plate, otherwise the gizmo would be closed (see deselect_all below).
+        else if (evt.LeftUp() && !m_mouse.ignore_left_up && !m_mouse.dragging && m_picking_enabled && !m_hover_plate_idxs.empty() && (m_canvas_type == CanvasView3D) && !is_layers_editing_enabled())
         {
                 int hover_idx = m_hover_plate_idxs.front();
                 wxGetApp().plater()->select_plate_by_hover_id(hover_idx);

src/slic3r/GUI/GLCanvas3D.hpp

@@ -1119,6 +1119,10 @@ public:
 
     void set_mouse_as_dragging() { m_mouse.dragging = true; }
     bool is_mouse_dragging() const { return m_mouse.dragging; }
+    // True when the current left up event comes from an ImGui window and was not processed by it
+    // (e.g. a drag that started on a gizmo floating window and was released over the 3D scene).
+    // Such a release is the end of an ImGui interaction, not a click on the scene.
+    bool is_mouse_left_up_ignored() const { return m_mouse.ignore_left_up; }
 
     double get_size_proportional_to_max_bed_size(double factor) const;
 

src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp

@@ -567,7 +567,10 @@ bool GLGizmoEmboss::on_mouse_for_translate(const wxMouseEvent &mouse_event)
 void GLGizmoEmboss::on_mouse_change_selection(const wxMouseEvent &mouse_event)
 {
     static bool was_dragging = true;
-    if ((mouse_event.LeftUp() || mouse_event.RightUp()) && !was_dragging) {
+    // The left up may be the end of a drag that started on the gizmo floating window (e.g. selecting
+    // text in the input field). Such a release is not a click on the scene and must not close the gizmo.
+    // (The flag is only set for left up events, so right up behavior is unchanged.)
+    if ((mouse_event.LeftUp() || mouse_event.RightUp()) && !was_dragging && !m_parent.is_mouse_left_up_ignored()) {
         // is hovered volume closest hovered?
         int hovered_idx = m_parent.get_first_hover_volume_idx();
         if (hovered_idx < 0)