Qt5: fix deprecation warnings for Qt 5.15

+ replace QDirModel with QFileSystemModel
+ QProcess::start(QString, OpenMode) is deprecated
+ QByteArray::append is deprecated
+ QPixmap* QLabel::pixmap() is deprecated

src/Gui/NetworkRetriever.cpp

@@ -374,7 +374,8 @@ void NetworkRetriever::wgetFinished(int exitCode, QProcess::ExitStatus status)
 bool NetworkRetriever::testWget()
 {
     QProcess proc;
-    proc.start(QString::fromLatin1("wget"));
+    proc.setProgram(QString::fromLatin1("wget"));
+    proc.start();
     bool ok = proc.state() == QProcess::Running;
     proc.kill();
     proc.waitForFinished();

src/Gui/OnlineDocumentation.cpp

@@ -255,8 +255,7 @@ QByteArray PythonOnlineHelp::fileNotFound() const
     QString http(QLatin1String("HTTP/1.1 %1 %2\r\n%3\r\n"));
     QString httpResponseHeader = http.arg(404).arg(QLatin1String("File not found")).arg(header);
 
-    QByteArray res;
-    res.append(httpResponseHeader);
+    QByteArray res = httpResponseHeader.toLatin1();
     return res;
 }
 
@@ -285,8 +284,7 @@ QByteArray PythonOnlineHelp::loadFailed(const QString& error) const
     QString http(QLatin1String("HTTP/1.1 %1 %2\r\n%3\r\n"));
     QString httpResponseHeader = http.arg(404).arg(QLatin1String("File not found")).arg(header);
 
-    QByteArray res;
-    res.append(httpResponseHeader);
+    QByteArray res = httpResponseHeader.toLatin1();
     return res;
 }
 

src/Gui/ProjectView.cpp

@@ -36,7 +36,7 @@
 # include <QTimer>
 #endif
 
-#include <QDirModel>
+#include <QFileSystemModel>
 #include <Base/Console.h>
 #include <App/Document.h>
 
@@ -56,8 +56,7 @@ using namespace Gui;
 ProjectWidget::ProjectWidget(QWidget* parent)
     : QTreeView(parent)
 {
-    fileModel = new QDirModel(this);
-    fileModel->setSorting(QDir::DirsFirst | QDir::Type);
+    fileModel = new QFileSystemModel(this);
     setModel(fileModel);
 }
 

src/Gui/ProjectView.h

@@ -31,7 +31,8 @@
 
 #include <Gui/DockWindow.h>
 #include <Gui/Selection.h>
-class QDirModel;
+
+class QFileSystemModel;
 
 namespace Gui {
 
@@ -48,7 +49,7 @@ public:
     ~ProjectWidget();
 
 private:
-    QDirModel *fileModel;
+    QFileSystemModel *fileModel;
  
 };
 

src/Gui/QSint/actionpanel/actionbox.cpp

@@ -116,6 +116,19 @@ void ActionBox::setIcon(const QPixmap & icon)
     iconLabel->setFixedSize(icon.size());
 }
 
+QPixmap ActionBox::icon() const
+{
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+    return iconLabel->pixmap(Qt::ReturnByValue);
+#else
+    QPixmap p;
+    const QPixmap* ptr = iconLabel->pixmap();
+    if (ptr)
+        p = *ptr;
+    return p;
+#endif
+}
+
 ActionLabel* ActionBox::createItem(QAction * action, QLayout * l)
 {
     if (!action)

src/Gui/QSint/actionpanel/actionbox.h

@@ -182,7 +182,7 @@ public:
     void setIcon(const QPixmap & icon);
     /** Returns icon of the ActionBox.
       */
-    inline const QPixmap* icon() const { return iconLabel->pixmap(); }
+    QPixmap icon() const;// { return iconLabel->pixmap(); }
 
     /** Returns header item of the ActionBox.
       */

src/Gui/QSint/actionpanel/taskgroup_p.cpp

@@ -106,7 +106,7 @@ void TaskGroup::keyPressEvent ( QKeyEvent * event )
   {
     case Qt::Key_Down:
     {
-      QKeyEvent ke(QEvent::KeyPress, Qt::Key_Tab, 0);
+      QKeyEvent ke(QEvent::KeyPress, Qt::Key_Tab, Qt::NoModifier);
       QApplication::sendEvent(this, &ke);
       return;
     }
@@ -131,7 +131,7 @@ void TaskGroup::keyReleaseEvent ( QKeyEvent * event )
   {
     case Qt::Key_Down:
     {
-      QKeyEvent ke(QEvent::KeyRelease, Qt::Key_Tab, 0);
+      QKeyEvent ke(QEvent::KeyRelease, Qt::Key_Tab, Qt::NoModifier);
       QApplication::sendEvent(this, &ke);
       return;
     }

src/Gui/QSint/actionpanel/taskheader_p.cpp

@@ -264,7 +264,7 @@ void TaskHeader::keyPressEvent ( QKeyEvent * event )
   {
     case Qt::Key_Down:
     {
-      QKeyEvent ke(QEvent::KeyPress, Qt::Key_Tab,0 );
+      QKeyEvent ke(QEvent::KeyPress, Qt::Key_Tab, Qt::NoModifier);
       QApplication::sendEvent(this, &ke);
       return;
     }
@@ -288,7 +288,7 @@ void TaskHeader::keyReleaseEvent ( QKeyEvent * event )
   {
     case Qt::Key_Down:
     {
-      QKeyEvent ke(QEvent::KeyRelease, Qt::Key_Tab, 0);
+      QKeyEvent ke(QEvent::KeyRelease, Qt::Key_Tab, Qt::NoModifier);
       QApplication::sendEvent(this, &ke);
       return;
     }

src/Gui/TaskElementColors.cpp

@@ -263,7 +263,7 @@ public:
                    boost::starts_with(msg.pSubName,editSub))
                 {
                     for(auto item : ui->elementList->findItems(
-                                QString::fromLatin1(msg.pSubName-editSub.size()),0))
+                                QString::fromLatin1(msg.pSubName-editSub.size()), Qt::MatchExactly))
                         item->setSelected(msg.Type==SelectionChanges::AddSelection);
                 }
             }