Fixes file combo-box resizing in SimBuilderDialog.

smtk/extension/qt/qtBaseView.cxx

@@ -318,6 +318,7 @@ void qtBaseView::makeTopLevel()
 
   this->m_ScrollArea = new QScrollArea(this->parentWidget());
   this->m_ScrollArea->setWidgetResizable(true);
+  this->m_ScrollArea->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
   this->m_ScrollArea->setFrameShape(QFrame::NoFrame);
   this->m_ScrollArea->setObjectName("topLevelScrollArea");
   parentlayout->addWidget(this->m_ScrollArea);

smtk/extension/qt/qtFileItem.cxx

@@ -229,7 +229,15 @@ QWidget* qtFileItem::createFileBrowseWidget(int elementIdx)
   if (lineEdit)
     lineEdit->setAlignment(Qt::AlignRight);
   else if (fileCombo)
+  {
     fileCombo->lineEdit()->setAlignment(Qt::AlignRight);
+    fileCombo->setMinimumContentsLength(10);
+
+    // http://doc.qt.io/qt-5/qcombobox.html#sizeAdjustPolicy-prop
+    // Recommends using QComboBox::AdjustToContents, but that does not seem to
+    // work on Linux.
+    fileCombo->setSizeAdjustPolicy(QComboBox::AdjustToMinimumContentsLength);
+  }
 
   frame->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);
   fileTextWidget->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed);