Fix delete key has no effect due to "Ambiguous shortcut overload"

We want to show the accelerator key in the menu but without hitting
the ambiguous overload error.
Fixup of 1378245a63

src/gui/mainwindow.cpp

@@ -840,6 +840,7 @@ void MainWindow::createKeyboardShortcuts()
     m_ui->actionCreateTorrent->setShortcut(QKeySequence::New);
     m_ui->actionOpen->setShortcut(QKeySequence::Open);
     m_ui->actionDelete->setShortcut(QKeySequence::Delete);
+    m_ui->actionDelete->setShortcutContext(Qt::WidgetShortcut);  // nullify its effect: delete key event is handled by respective widgets, not here
     m_ui->actionDownloadFromURL->setShortcut(Qt::CTRL + Qt::SHIFT + Qt::Key_O);
     m_ui->actionExit->setShortcut(Qt::CTRL + Qt::Key_Q);
 

src/gui/transferlistwidget.cpp

@@ -285,6 +285,7 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *mainWindow)
     connect(header(), SIGNAL(sortIndicatorChanged(int, Qt::SortOrder)), this, SLOT(saveSettings()));
 
     m_editHotkey = new QShortcut(Qt::Key_F2, this, SLOT(renameSelectedTorrent()), 0, Qt::WidgetShortcut);
+    m_deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(softDeleteSelectedTorrents()), 0, Qt::WidgetShortcut);
     m_permDeleteHotkey = new QShortcut(Qt::SHIFT + Qt::Key_Delete, this, SLOT(permDeleteSelectedTorrents()), 0, Qt::WidgetShortcut);
     m_doubleClickHotkey = new QShortcut(Qt::Key_Return, this, SLOT(torrentDoubleClicked()), 0, Qt::WidgetShortcut);
     m_recheckHotkey = new QShortcut(Qt::CTRL + Qt::Key_R, this, SLOT(recheckSelectedTorrents()), 0, Qt::WidgetShortcut);

src/gui/transferlistwidget.h

@@ -132,6 +132,7 @@ private:
     TransferListSortModel *m_sortFilterModel;
     MainWindow *m_mainWindow;
     QShortcut *m_editHotkey;
+    QShortcut *m_deleteHotkey;
     QShortcut *m_permDeleteHotkey;
     QShortcut *m_doubleClickHotkey;
     QShortcut *m_recheckHotkey;