CMake GUI: Improve signal specification

Don't use subclasses to connect to QAbstractButton::clicked. This is
slightly dodgy, but of more immediate importance, tweaking it will allow
us to change the widget type of some QToolButton instances that should
be QPushButton.

Source/QtDialog/CMakeSetupDialog.cxx

@@ -253,7 +253,7 @@ void CMakeSetupDialog::initialize()
                    &QCMake::propertiesChanged, this->CacheValues->cacheModel(),
                    &QCMakeCacheModel::setProperties);
 
-  QObject::connect(this->ConfigureButton, &QPushButton::clicked, this,
+  QObject::connect(this->ConfigureButton, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::doConfigure);
 
   QObject::connect(this->CMakeThread->cmakeInstance(), &QCMake::configureDone,
@@ -261,15 +261,17 @@ void CMakeSetupDialog::initialize()
   QObject::connect(this->CMakeThread->cmakeInstance(), &QCMake::generateDone,
                    this, &CMakeSetupDialog::exitLoop);
 
-  QObject::connect(this->GenerateButton, &QPushButton::clicked, this,
+  QObject::connect(this->GenerateButton, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::doGenerate);
-  QObject::connect(this->OpenProjectButton, &QPushButton::clicked, this,
+  QObject::connect(this->OpenProjectButton, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::doOpenProject);
 
-  QObject::connect(this->BrowseSourceDirectoryButton, &QPushButton::clicked,
+  QObject::connect(this->BrowseSourceDirectoryButton,
-                   this, &CMakeSetupDialog::doSourceBrowse);
+                   &QAbstractButton::clicked, this,
-  QObject::connect(this->BrowseBinaryDirectoryButton, &QPushButton::clicked,
+                   &CMakeSetupDialog::doSourceBrowse);
-                   this, &CMakeSetupDialog::doBinaryBrowse);
+  QObject::connect(this->BrowseBinaryDirectoryButton,
+                   &QAbstractButton::clicked, this,
+                   &CMakeSetupDialog::doBinaryBrowse);
 
   QObject::connect(this->BinaryDirectory, &QComboBox::editTextChanged, this,
                    &CMakeSetupDialog::onBinaryDirectoryChanged);
@@ -324,12 +326,12 @@ void CMakeSetupDialog::initialize()
   QObject::connect(this->CacheValues->selectionModel(),
                    &QItemSelectionModel::selectionChanged, this,
                    &CMakeSetupDialog::selectionChanged);
-  QObject::connect(this->RemoveEntry, &QToolButton::clicked, this,
+  QObject::connect(this->RemoveEntry, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::removeSelectedCacheEntries);
-  QObject::connect(this->AddEntry, &QToolButton::clicked, this,
+  QObject::connect(this->AddEntry, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::addCacheEntry);
 
-  QObject::connect(this->Environment, &QToolButton::clicked, this,
+  QObject::connect(this->Environment, &QAbstractButton::clicked, this,
                    &CMakeSetupDialog::editEnvironment);
 
   QObject::connect(this->WarnUninitializedAction, &QAction::triggered,

Source/QtDialog/EnvironmentDialog.cxx

@@ -106,9 +106,9 @@ EnvironmentDialog::EnvironmentDialog(const QProcessEnvironment& environment,
   this->Environment->setSelectionMode(QAbstractItemView::ExtendedSelection);
   this->Environment->setSelectionBehavior(QAbstractItemView::SelectRows);
 
-  QObject::connect(this->AddEntry, &QToolButton::clicked, this,
+  QObject::connect(this->AddEntry, &QAbstractButton::clicked, this,
                    &EnvironmentDialog::addEntry);
-  QObject::connect(this->RemoveEntry, &QToolButton::clicked, this,
+  QObject::connect(this->RemoveEntry, &QAbstractButton::clicked, this,
                    &EnvironmentDialog::removeSelectedEntries);
   QObject::connect(this->Search, &QLineEdit::textChanged, this->m_filter,
                    &EnvironmentSearchFilter::setFilterFixedString);

Source/QtDialog/QCMakeWidgets.cxx

@@ -25,7 +25,7 @@ QCMakeFileEditor::QCMakeFileEditor(QWidget* p, QString var)
   this->ToolButton = new QToolButton(this);
   this->ToolButton->setText("...");
   this->ToolButton->setCursor(QCursor(Qt::ArrowCursor));
-  QObject::connect(this->ToolButton, &QToolButton::clicked, this,
+  QObject::connect(this->ToolButton, &QAbstractButton::clicked, this,
                    &QCMakeFileEditor::chooseFile);
 }