Replace all remaining functions deprecated in Qt 5, if possible.

These are:
    - QInputDialog::getInteger() [-> getInt()]
    - QKeySequence::operator QString() [-> toString()]
    - QRegion::intersect() [-> intersected()]
    - qVariantCanConvert() [-> QVariant::canConvert()]

Plus some left-over occurrences of qFindChild() and
QAbstractItemModel::reset() that were missed by the
respective earlier patches.

All deprecated features still left are not trivially
replaceable, i.e. the code using them cannot be made
to compile with both Qt 4 and Qt 5.

Change-Id: I32541681bbf66b0fef78f5c7025521f9ff84f463
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/git/gitplugin.cpp

@@ -814,7 +814,7 @@ static inline GitClientMemberFunc memberFunctionFromAction(const QObject *o)
     if (o) {
         if (const QAction *action = qobject_cast<const QAction *>(o)) {
             const QVariant v = action->data();
-            if (qVariantCanConvert<GitClientMemberFunc>(v))
+            if (v.canConvert<GitClientMemberFunc>())
                 return qvariant_cast<GitClientMemberFunc>(v);
         }
     }

src/plugins/git/gitutils.cpp

@@ -88,7 +88,7 @@ bool inputText(QWidget *parent, const QString &title, const QString &prompt, QSt
     dialog.setLabelText(prompt);
     dialog.setTextValue(*s);
     // Nasty hack:
-    if (QLineEdit *le = qFindChild<QLineEdit*>(&dialog))
+    if (QLineEdit *le = dialog.findChild<QLineEdit*>())
         le->setMinimumWidth(500);
     if (dialog.exec() != QDialog::Accepted)
         return false;

src/plugins/git/remotemodel.cpp

@@ -186,8 +186,9 @@ void RemoteModel::clear()
 {
     if (m_remotes.isEmpty())
         return;
+    beginResetModel();
     m_remotes.clear();
-    reset();
+    endResetModel();
 }
 
 bool RemoteModel::refresh(const QString &workingDirectory, QString *errorMessage)
@@ -200,6 +201,7 @@ bool RemoteModel::refresh(const QString &workingDirectory, QString *errorMessage
         return false;
     // Parse output
     m_workingDirectory = workingDirectory;
+    beginResetModel();
     m_remotes.clear();
     const QStringList lines = output.split(QLatin1Char('\n'));
     for (int r = 0; r < lines.count(); ++r) {
@@ -207,7 +209,7 @@ bool RemoteModel::refresh(const QString &workingDirectory, QString *errorMessage
         if (newRemote.parse(lines.at(r)))
             m_remotes.push_back(newRemote);
     }
-    reset();
+    endResetModel();
     return true;
 }