Fix GUI freezing while nesting.

ChangeLog.txt

@@ -37,6 +37,7 @@
 - Support for Dark mode.
 - Fix issue with passing incorrect number of dimension to Tape.
 - New option: Pointer mode.
+- Fix GUI freezing while nesting. 
 
 # Valentina 0.7.52 September 12, 2022
 - Fix crash when default locale is ru.

src/app/valentina/mainwindowsnogui.cpp

@@ -278,7 +278,15 @@ auto MainWindowsNoGUI::GenerateLayout(VLayoutGenerator &lGenerator) -> bool
             break;
         }
 
-        lGenerator.Generate(timer, lGenerator.GetNestingTimeMSecs(), nestingState);
+        {
+            QEventLoop wait;
+            QFutureWatcher<void> fw;
+            fw.setFuture(
+                QtConcurrent::run([&lGenerator, timer, nestingState]()
+                                  { lGenerator.Generate(timer, lGenerator.GetNestingTimeMSecs(), nestingState); }));
+            QObject::connect(&fw, &QFutureWatcher<void>::finished, &wait, &QEventLoop::quit);
+            wait.exec();
+        }
 
         if (IsTimeout())
         {
@@ -380,12 +388,14 @@ auto MainWindowsNoGUI::GenerateLayout(VLayoutGenerator &lGenerator) -> bool
                 break;
         }
 
-        nestingState = lGenerator.State();
-
         if (nestingState == LayoutErrors::PrepareLayoutError || nestingState == LayoutErrors::ProcessStoped ||
-            nestingState == LayoutErrors::TerminatedByException ||
-            (nestingState == LayoutErrors::NoError && not qFuzzyIsNull(lGenerator.GetEfficiencyCoefficient()) &&
-             efficiency >= lGenerator.GetEfficiencyCoefficient()))
+            nestingState == LayoutErrors::TerminatedByException)
+        {
+            break;
+        }
+
+        if (nestingState == LayoutErrors::NoError && not qFuzzyIsNull(lGenerator.GetEfficiencyCoefficient()) &&
+            efficiency >= lGenerator.GetEfficiencyCoefficient())
         {
             if (not lGenerator.IsPreferOneSheetSolution() || lGenerator.PapersCount() == 1)
             {

src/libs/vlayout/vlayoutgenerator.cpp

@@ -214,8 +214,6 @@ void VLayoutGenerator::Generate(const QElapsedTimer &timer, qint64 timeout, Layo
                     return;
                 }
 
-                QCoreApplication::processEvents();
-
                 if (stopGeneration.load())
                 {
                     break;

src/libs/vlayout/vposition.cpp

@@ -238,27 +238,12 @@ auto VPosition::ArrangeDetail(const VPositionData &data, std::atomic_bool *stop,
 
     watcher.setFuture(QtConcurrent::mapped(jobs, Nest));
 
-    while (not watcher.isStarted())
-    {
-        QCoreApplication::processEvents();
-        QThread::msleep(250);
-    }
-
-    // Wait for done
-    do
-    {
-        QCoreApplication::processEvents();
-        QThread::msleep(250);
-    } while (watcher.isRunning() && not stop->load());
+    QEventLoop wait;
+    QObject::connect(&watcher, &QFutureWatcher<VBestSquare>::finished, &wait, &QEventLoop::quit);
+    wait.exec();
 
     if (stop->load())
     {
-        do
-        {
-            QCoreApplication::processEvents();
-            QThread::msleep(250);
-        } while (watcher.isRunning());
-
         return bestResult;
     }