Avoid issue with invisible status indication.

src/slic3r/CMakeLists.txt

@@ -173,7 +173,7 @@ set(SLIC3R_GUI_SOURCES
     GUI/Jobs/BoostThreadWorker.hpp
     GUI/Jobs/BoostThreadWorker.cpp
     GUI/Jobs/BusyCursorJob.hpp
-    GUI/Jobs/PlaterJob.hpp
+    GUI/Jobs/PlaterWorker.hpp
     GUI/Jobs/ArrangeJob.hpp
     GUI/Jobs/ArrangeJob.cpp
     GUI/Jobs/RotoptimizeJob.hpp

src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp

@@ -11,7 +11,6 @@
 #include "libslic3r/PresetBundle.hpp"
 
 #include "slic3r/GUI/Jobs/RotoptimizeJob.hpp"
-#include "slic3r/GUI/Jobs/PlaterJob.hpp"
 
 namespace Slic3r {
 namespace GUI {

src/slic3r/GUI/Jobs/ArrangeJob.cpp

@@ -164,10 +164,11 @@ void ArrangeJob::prepare()
 
 void ArrangeJob::process(Ctl &ctl)
 {
-    ctl.call_on_main_thread([this]{ prepare(); }).wait();
-
     static const auto arrangestr = _u8L("Arranging");
 
+    ctl.update_status(0, arrangestr);
+    ctl.call_on_main_thread([this]{ prepare(); }).wait();;
+
     arrangement::ArrangeParams params = get_arrange_params(m_plater);
 
     auto   count  = unsigned(m_selected.size() + m_unprintable.size());
@@ -196,7 +197,7 @@ void ArrangeJob::process(Ctl &ctl)
                                       _u8L("Arranging done."));
 }
 
-ArrangeJob::ArrangeJob() : m_plater{wxGetApp().plater()} { }
+ArrangeJob::ArrangeJob() : m_plater{wxGetApp().plater()} {}
 
 static std::string concat_strings(const std::set<std::string> &strings,
                                   const std::string &delim = "\n")

src/slic3r/GUI/Jobs/BoostThreadWorker.cpp

@@ -29,7 +29,7 @@ void BoostThreadWorker::WorkerMessage::deliver(BoostThreadWorker &runner)
     case MainThreadCall: {
         MainThreadCallData &calldata = std::get<MainThreadCall>(m_data);
         calldata.fn();
-        calldata.barrier.set_value();
+        calldata.promise.set_value();
 
         break;
     }
@@ -69,7 +69,7 @@ void BoostThreadWorker::update_status(int st, const std::string &msg)
 std::future<void> BoostThreadWorker::call_on_main_thread(std::function<void ()> fn)
 {
     MainThreadCallData cbdata{std::move(fn), {}};
-    std::future<void> future = cbdata.barrier.get_future();
+    std::future<void> future = cbdata.promise.get_future();
 
     m_output_queue.push(std::move(cbdata));
 

src/slic3r/GUI/Jobs/BoostThreadWorker.hpp

@@ -39,7 +39,7 @@ class BoostThreadWorker : public Worker, private Job::Ctl
     struct MainThreadCallData
     {
         std::function<void()> fn;
-        std::promise<void>    barrier;
+        std::promise<void>    promise;
     };
 
     class WorkerMessage
@@ -55,6 +55,8 @@ class BoostThreadWorker : public Worker, private Job::Ctl
         WorkerMessage(JobEntry &&entry) : m_data{std::move(entry)} {}
         WorkerMessage(MainThreadCallData fn) : m_data{std::move(fn)} {}
 
+        int get_type () const { return m_data.index(); }
+
         void deliver(BoostThreadWorker &runner);
     };
 

src/slic3r/GUI/Jobs/FillBedJob.cpp

@@ -105,7 +105,9 @@ void FillBedJob::prepare()
 
 void FillBedJob::process(Ctl &ctl)
 {
-    ctl.call_on_main_thread([this]{ prepare(); }).wait();
+    auto statustxt = _u8L("Filling bed");
+    ctl.call_on_main_thread([this] { prepare(); }).wait();
+    ctl.update_status(0, statustxt);
 
     if (m_object_idx == -1 || m_selected.empty()) return;
 
@@ -121,10 +123,6 @@ void FillBedJob::process(Ctl &ctl)
         return ctl.was_canceled() || do_stop;
     };
 
-    auto statustxt = _u8L("Filling bed");
-
-    ctl.update_status(0, statustxt);
-
     params.progressind = [this, &ctl, &statustxt](unsigned st) {
         if (st > 0)
             ctl.update_status(int(m_status_range - st) * 100 / status_range(), statustxt);

src/slic3r/GUI/Jobs/PlaterWorker.hpp

@@ -1,5 +1,5 @@
-#ifndef PLATERJOB_HPP
+#ifndef PLATERWORKER_HPP
-#define PLATERJOB_HPP
+#define PLATERWORKER_HPP
 
 #include "BusyCursorJob.hpp"
 
@@ -24,8 +24,32 @@ class PlaterWorker: public Worker {
     public:
         void process(Ctl &c) override
         {
-            CursorSetterRAII busycursor{c};
+            // Ensure that wxWidgets processing wakes up to handle outgoing
-            m_job->process(c);
+            // messages in plater's wxIdle handler. Otherwise it might happen
+            // that the message will only be processed when an event like mouse
+            // move comes along which might be too late.
+            struct WakeUpCtl: Ctl {
+                Ctl &ctl;
+                WakeUpCtl(Ctl &c) : ctl{c} {}
+
+                void update_status(int st, const std::string &msg = "") override
+                {
+                    wxWakeUpIdle();
+                    ctl.update_status(st, msg);
+                }
+
+                bool was_canceled() const override { return ctl.was_canceled(); }
+
+                std::future<void> call_on_main_thread(std::function<void()> fn) override
+                {
+                    wxWakeUpIdle();
+                    return ctl.call_on_main_thread(std::move(fn));
+                }
+
+            } wctl{c};
+
+            CursorSetterRAII busycursor{wctl};
+            m_job->process(wctl);
         }
 
         void finalize(bool canceled, std::exception_ptr &eptr) override
@@ -60,10 +84,18 @@ class PlaterWorker: public Worker {
         }
     };
 
-public:
 
-    template<class ... WorkerArgs>
+public:
-    PlaterWorker(WorkerArgs &&...args) : m_w{std::forward<WorkerArgs>(args)...} {}
+    template<class... WorkerArgs>
+    PlaterWorker(Plater *plater, WorkerArgs &&...args)
+        : m_w{std::forward<WorkerArgs>(args)...}
+    {
+        // Ensure that messages from the worker thread to the UI thread are
+        // processed continuously.
+        plater->Bind(wxEVT_IDLE, [this](wxIdleEvent &) {
+            m_w.process_events();
+        });
+    }
 
     // Always package the job argument into a PlaterJob
     bool start_next(std::unique_ptr<Job> job) override
@@ -74,7 +106,7 @@ public:
     bool is_idle() const override { return m_w.is_idle(); }
     void cancel() override { m_w.cancel(); }
     void cancel_all() override { m_w.cancel_all(); }
-    void process_events() override { m_w.process_events(); }
+    void process_events() override {}
 };
 
 }} // namespace Slic3r::GUI

src/slic3r/GUI/Plater.cpp

@@ -75,7 +75,7 @@
 #include "Jobs/SLAImportJob.hpp"
 #include "Jobs/SLAImportDialog.hpp"
 #include "Jobs/NotificationProgressIndicator.hpp"
-#include "Jobs/PlaterJob.hpp"
+#include "Jobs/PlaterWorker.hpp"
 #include "Jobs/BoostThreadWorker.hpp"
 #include "BackgroundSlicingProcess.hpp"
 #include "PrintHostDialogs.hpp"
@@ -1943,7 +1943,7 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
         }))
     , sidebar(new Sidebar(q))
     , notification_manager(std::make_unique<NotificationManager>(q))
-    , m_worker{std::make_unique<NotificationProgressIndicator>(notification_manager.get()), "ui_worker"}
+    , m_worker{q, std::make_unique<NotificationProgressIndicator>(notification_manager.get()), "ui_worker"}
     , m_sla_import_dlg{new SLAImportDialog{q}}
     , delayed_scene_refresh(false)
     , view_toolbar(GLToolbar::Radio, "View")
@@ -2173,12 +2173,6 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
         bool is_collapsed = wxGetApp().app_config->get("collapsed_sidebar") == "1";
         sidebar->collapse(is_collapsed);
     }
-
-    // Ensure that messages from the worker thread to the UI thread are processed
-    // continuously.
-    main_frame->Bind(wxEVT_IDLE, [this](const wxIdleEvent &) {
-        m_worker.process_events();
-    });
 }
 
 Plater::priv::~priv()