Enable switching from/to DiffView based on 'merge' prop status

Switch from Editor mode to DiffView based on 'merge' prop status. History, value and cleanGeneration are preserved.

src/codemirror.vue

@@ -84,6 +84,9 @@
  }
  }
  },
+ merge(newVal) {
+ this.$nextTick(this.switchMerge);
+ },
  code(newVal, oldVal) {
  this.handerCodeChange(newVal, oldVal)
  },
@@ -179,6 +182,19 @@
  this.cminstance.setGutterMarker(line, 'breakpoints', info.gutterMarkers ? null : this.marker())
  })
  }
+ },
+ switchMerge() {
+ // Save current values
+ let history = this.cminstance.doc.history;
+ let cleanGeneration = this.cminstance.doc.cleanGeneration;
+ this.options.value = this.cminstance.getValue();
+
+ this.destroy();
+ this.initialize();
+
+ // Restore values
+ this.cminstance.doc.history = history;
+ this.cminstance.doc.cleanGeneration = cleanGeneration;
  }
  },
  mounted() {