message: Fix timing of when Composer considers itself to be modified
diff: @@ -126,6 +126,7 @@ export default class BasicMessageEditor extends React.Component {
  }
  _updateEditorState = (selection, inputType, diff) => {
  + this._modifiedFlag = true;
  renderModel(this._editorRef, this.props.model);
  if (selection) { // set the caret/selection
  try {
  @@ -205,7 +206,6 @@ export default class BasicMessageEditor extends React.Component {
  const {partCreator} = model;
  const text = event.clipboardData.getData("text/plain");
  if (text) {
  - this._modifiedFlag = true;
  const range = getRangeForSelection(this._editorRef, model, document.getSelection());
  const parts = parsePlainTextMessage(text, partCreator);
  replaceRangeAndMoveCaret(range, parts);
  @@ -218,7 +218,6 @@ export default class BasicMessageEditor extends React.Component {
  if (this._isIMEComposing) {
  return;
  }
  - this._modifiedFlag = true;
  const sel = document.getSelection();
  const {caret, text} = getCaretOffsetAndText(this._editorRef, sel);
  this.props.model.update(text, event.inputType, caret);
  @@ -230,7 +229,6 @@ export default class BasicMessageEditor extends React.Component {
  const newText = text.substr(0, caret.offset) + textToInsert + text.substr(caret.offset);
  caret.offset += textToInsert.length;
  this.props.model.update(newText, inputType, caret);
  - this._modifiedFlag = true;
  }
  // this is used later to see if we need to recalculate the caret
  