logic: preselecting SearchNodes for autocompletion by prefiltering the Graph with the entered Query

This change only shows matches in the autocompletion list that are prefiltered by the already entered query. The
autocompletion now also shows up after an operator of type . or > has been entered to show an alphabetical list of
possible tokens.

src/app/qt/element/QtSmartSearchBox.cpp

@@ -159,7 +159,7 @@ void QtSmartSearchBox::keyPressEvent(QKeyEvent* event)
 			selectAllElementsWith(false);
 			layoutElements();
 		}
-		else if (cursorPosition() == text().size() && (text().size() || m_cursorIndex < static_cast<int>(m_elements.size())))
+		else if (cursorPosition() == text().size() && (text().size() || m_cursorIndex < m_elements.size()))
 		{
 			if (!editTextToElement())
 			{
@@ -179,7 +179,7 @@ void QtSmartSearchBox::keyPressEvent(QKeyEvent* event)
 	}
 	else if (event->matches(QKeySequence::SelectNextChar))
 	{
-		if (cursorPosition() == text().size() && m_cursorIndex < static_cast<int>(m_elements.size()))
+		if (cursorPosition() == text().size() && m_cursorIndex < m_elements.size())
 		{
 			editTextToElement();
 			m_elements[m_cursorIndex]->setChecked(!m_elements[m_cursorIndex]->isChecked());
@@ -194,7 +194,7 @@ void QtSmartSearchBox::keyPressEvent(QKeyEvent* event)
 	}
 	else if (event->matches(QKeySequence::MoveToEndOfLine))
 	{
-		if (m_cursorIndex < static_cast<int>(m_elements.size()))
+		if (m_cursorIndex < m_elements.size())
 		{
 			editTextToElement();
 			moveCursorTo(m_elements.size());
@@ -343,9 +343,9 @@ void QtSmartSearchBox::onTextEdited(const QString& text)
 		layoutElements();
 	}
 
-	if (token.size())
+	if (token.size() || m_elements.size())
 	{
-		MessageSearchAutocomplete(token).dispatch();
+		requestAutoCompletions();
 	}
 }
 
@@ -398,7 +398,7 @@ void QtSmartSearchBox::onElementSelected(QtQueryElement* element)
 		return;
 	}
 
-	int idx = 0;
+	size_t idx = 0;
 	bool checked = element->isChecked();
 	for (size_t i = 0; i < m_elements.size(); i++)
 	{
@@ -503,7 +503,7 @@ void QtSmartSearchBox::editElement(QtQueryElement* element)
 	setEditText(QString::fromStdString(token));
 	updateElements();
 
-	MessageSearchAutocomplete(token).dispatch();
+	requestAutoCompletions();
 }
 
 void QtSmartSearchBox::updateElements()
@@ -514,6 +514,8 @@ void QtSmartSearchBox::updateElements()
 	{
 		std::string name = QueryTree::getTokenName(token);
 
+		name = utility::replace(name, "&", "&&");
+
 		std::shared_ptr<QtQueryElement> element = std::make_shared<QtQueryElement>(QString::fromStdString(name), this);
 		m_elements.push_back(element);
 
@@ -538,7 +540,7 @@ void QtSmartSearchBox::layoutElements()
 
 	for (size_t i = 0; i <= m_elements.size(); i++)
 	{
-		if (!hasSelected && static_cast<int>(i) == m_cursorIndex)
+		if (!hasSelected && i == m_cursorIndex)
 		{
 			int left, top, right, bottom;
 			getTextMargins(&left, &top, &right, &bottom);
@@ -597,10 +599,10 @@ void QtSmartSearchBox::selectAllElementsWith(bool selected)
 	}
 }
 
-void QtSmartSearchBox::selectElementsTo(int idx, bool selected)
+void QtSmartSearchBox::selectElementsTo(size_t idx, bool selected)
 {
-	int low = idx < m_cursorIndex ? idx : m_cursorIndex;
-	int hi = idx > m_cursorIndex ? idx + 1 : m_cursorIndex;
+	size_t low = idx < m_cursorIndex ? idx : m_cursorIndex;
+	size_t hi = idx > m_cursorIndex ? idx + 1 : m_cursorIndex;
 
 	while (low < hi)
 	{
@@ -630,13 +632,13 @@ void QtSmartSearchBox::deleteSelectedElements()
 		return;
 	}
 
-	for (int i = m_elements.size() - 1; i >= 0; i--)
+	for (size_t i = m_elements.size(); i > 0; i--)
 	{
-		if (m_elements[i]->isChecked())
+		if (m_elements[i - 1]->isChecked())
 		{
-			m_tokens.erase(m_tokens.begin() + i);
+			m_tokens.erase(m_tokens.begin() + (i - 1));
 
-			if (i < m_cursorIndex)
+			if ((i - 1) < m_cursorIndex)
 			{
 				m_cursorIndex--;
 			}
@@ -667,3 +669,15 @@ void QtSmartSearchBox::clearLineEdit()
 		completer()->popup()->hide();
 	}
 }
+
+void QtSmartSearchBox::requestAutoCompletions() const
+{
+	std::string query;
+
+	for (size_t i = 0; i < m_tokens.size() && i < m_cursorIndex; i++)
+	{
+		query += m_tokens[i];
+	}
+
+	MessageSearchAutocomplete(query, text().toStdString()).dispatch();
+}