Repair the mechanism of modify phrase in UserphraseView

The phrase can be preserved when the "add" step in "modify" is failed.

After a new phrase is added, the selection of the original phrase in
chewing-editor seems to be reset, then the remove() in UserphaseView
will lost the remove target.
So I check the modified phrase add to the database successfully or not,
If the adding is fail, then re-add the original phrase.

Resolves: chewing#75
See also: chewing#109

src/model/UserphraseModel.cpp

@@ -201,6 +201,8 @@ void UserphraseModel::add(const QString &phrase, const QString &bopomofo)
         phrase.toUtf8().constData(),
         bopomofo.toUtf8().constData());
 
+    addResult = ret;
+
     if (ret > 0) {
         emit beginResetModel();
         userphrase_.insert(Userphrase{

src/model/UserphraseModel.h

@@ -45,6 +45,7 @@ class UserphraseModel final: public QAbstractListModel {
 
     const Userphrase *getUserphrase(const QModelIndex& idx);
 
+    int getAddResult(){return addResult;}
 signals:
     void importCompleted(
         bool result,
@@ -71,4 +72,5 @@ public slots:
 
     std::unique_ptr<ChewingContext, void (*)(ChewingContext*)> ctx_;
     UserphraseSet userphrase_;
+    int addResult;
 };

src/model/UserphraseSortFilterProxyModel.cpp

@@ -53,3 +53,8 @@ const Userphrase *UserphraseSortFilterProxyModel::getUserphrase(const QModelInde
 {
     return sourceModel()->getUserphrase(mapToSource(idx));
 }
+
+int UserphraseSortFilterProxyModel::getAddResult()
+{
+    return sourceModel()->getAddResult();
+}

src/model/UserphraseSortFilterProxyModel.h

@@ -42,6 +42,7 @@ class UserphraseSortFilterProxyModel final : public QSortFilterProxyModel {
 
     const Userphrase *getUserphrase(const QModelIndex& idx);
 
+    int getAddResult();
 public slots:
     void add(std::shared_ptr<QString> phrase, std::shared_ptr<QString> bopomofo);
     void remove(QModelIndexList indexList);

src/view/UserphraseView.cpp

@@ -17,7 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "UserphraseModel.h"
 #include "UserphraseView.h"
 
 #include <QDebug>
@@ -26,6 +25,8 @@ UserphraseView::UserphraseView(QWidget *parent)
     :QListView{parent}
     ,UserphraseDialog_{new UserphraseDialog{this}}
     ,menu_(new UserphraseViewMenu{this})
+    ,originalPhrase{new QString()}
+    ,originalBopomofo{new QString()}
 {
     setupContextMenu();
     setupAddUserphraseDialog();
@@ -53,9 +54,12 @@ void UserphraseView::showModifyUserphraseDialog()
     dialogType_ = DIALOG_MODIFY;
 
     auto userphrase = model()->getUserphrase(selectionModel()->selectedIndexes().first());
-
     UserphraseDialog_->setText(userphrase->phrase_, userphrase->bopomofo_);
     UserphraseDialog_->setWindowTitle(tr("Modify phrase"));
+
+    *originalPhrase = UserphraseDialog_->getPhrase();
+    *originalBopomofo = UserphraseDialog_->getBopomofo();
+
     emit UserphraseDialog_->exec();
 }
 
@@ -75,6 +79,12 @@ void UserphraseView::addPhrase(int result)
     }
 
     emit model()->add(phrase, bopomofo);
+
+    if (dialogType_ == DIALOG_MODIFY) {
+	if(model()->getAddResult() <= 0) {
+            emit model()->add(originalPhrase, originalBopomofo);
+        }
+    }
 }
 
 void UserphraseView::remove()

src/view/UserphraseView.h

@@ -64,4 +64,7 @@ public slots:
     UserphraseViewMenu *menu_;
 
     bool dialogType_;
+
+    std::shared_ptr<QString> originalPhrase;
+    std::shared_ptr<QString> originalBopomofo;
 };