On panic, backup modified buffers only

cmd/micro/micro.go

@@ -352,9 +352,11 @@ func main() {
 			} else {
 				fmt.Println("Micro encountered an error:", errors.Wrap(err, 2).ErrorStack(), "\nIf you can reproduce this error, please report it at https://github.com/zyedidia/micro/issues")
 			}
-			// backup all open buffers
+			// immediately backup all buffers with unsaved changes
 			for _, b := range buffer.OpenBuffers {
-				b.Backup()
+				if b.Modified() {
+					b.Backup()
+				}
 			}
 			exit(1)
 		}

cmd/micro/micro_test.go

@@ -55,9 +55,11 @@ func startup(args []string) (tcell.SimulationScreen, error) {
 		if err := recover(); err != nil {
 			screen.Screen.Fini()
 			fmt.Println("Micro encountered an error:", err)
-			// backup all open buffers
+			// immediately backup all buffers with unsaved changes
 			for _, b := range buffer.OpenBuffers {
-				b.Backup()
+				if b.Modified() {
+					b.Backup()
+				}
 			}
 			// Print the stack trace too
 			log.Fatalf(errors.Wrap(err, 2).ErrorStack())