gtk: Add workaround for long transition of check/radio (fix #148)

src/_sass/gtk/_common-3.20.scss

@@ -2142,6 +2142,7 @@ radio {

                                
                                
                                
                            
                                
                                    
                                        
                                            2142  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2143  
                                              popover & {
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2144  
                                                &, &:focus, &:hover, &:active, &:disabled {
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        2145 +
                                              transition: none; // FIXME: this is a workaround for a popover check/radio long transition issue
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2146  
                                                  box-shadow: none;
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2147  
                                                  background-image: none;
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            2148  
                                                }