close diff window when changes to file are discarded (#1132)

* close diff window when changes to file are discarded

* add callback to close diff window

* Update src/commandsAndMenu.tsx

Remove console log

Co-authored-by: Frédéric Collonval <fcollonval@users.noreply.github.com>

Co-authored-by: Frédéric Collonval <fcollonval@users.noreply.github.com>

Author: BoscoCHW

src/commandsAndMenu.tsx

@@ -606,6 +606,15 @@ export function addCommands(
             })`;
             modelIsLoading.reject(msg);
           }
+
+          gitModel.statusChanged.connect((_, status) => {
+            const targetFile = status.files.find(
+              fileStatus => model.filename === fileStatus.from
+            );
+            if (!targetFile || targetFile.status === 'unmodified') {
+              mainAreaItem.dispose();
+            }
+          });
         }
 
         return mainAreaItem;