Sanitize numeric input

main.py

@@ -242,6 +242,10 @@ class BackgroundWindow(Gtk.Window):

                                
                                
                                
                            
                                
                                    
                                        
                                            242  
                                                        else:
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            243  
                                                            self.all_sources.append(path)
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            244  
                                                    self.all_sources = self.all_sources
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        245 +
                                                if self.time_per_image <= 0:
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        246 +
                                                    self.time_per_image = 120
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        247 +
                                                if self.transition_ms <= 0:
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        248 +
                                                    self.transition_ms = 1000
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            249  
                                                    self.stack.set_transition_duration(self.transition_ms)
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            250  
                                                    if self.time_per_image * 1000 < self.transition_ms:
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            251  
                                                        self.time_per_image = self.transition_ms / 500