Silence Qt/Windows setGeometry Warning

Add the optional Qt::MSWindowsFixedSizeDialogHint parameter to all uses of the QInputDialog::getX static functions to silence a Qt/Windows debug mode warning about QWindowsWindow::setGeometry: Unable to set geometry. Increase the size of the unit calculator to eliminate the same warning. Finally, call adjustSize() on the "Unsaved Changes" dialog to silence the warning.

src/Gui/MainWindow.cpp

@@ -648,6 +648,7 @@ int MainWindow::confirmSave(const char *docName, QWidget *parent, bool addCheckb
     }
 
     int res = 0;
+    box.adjustSize(); // Silence warnings from Qt on Windows
     switch (box.exec())
     {
     case QMessageBox::Save: