logic: Fixed issues in search

* fixed bad search performance when rescoring
* fixed commands had no text in autocompletions
* no autocompletions when entering fulltext search query
* check query actuality before processing autocompletions

src/lib_gui/qt/element/QtSearchBar.cpp

@@ -66,6 +66,11 @@ QSize QtSearchBar::sizeHint() const
 	return QSize(400, 100);
 }
 
+QString QtSearchBar::query() const
+{
+	return m_searchBox->text();
+}
+
 void QtSearchBar::setMatches(const std::vector<SearchMatch>& matches)
 {
 	m_searchBox->setMatches(matches);

src/lib_gui/qt/element/QtSearchBar.h

@@ -22,6 +22,8 @@ public:
 
 	virtual QSize sizeHint() const;
 
+	QString query() const;
+
 	void setMatches(const std::vector<SearchMatch>& matches);
 	void setFocus();
 	void findFulltext();

src/lib_gui/qt/element/QtSmartSearchBox.cpp

@@ -895,7 +895,7 @@ void QtSmartSearchBox::clearLineEdit()
 
 void QtSmartSearchBox::requestAutoCompletions()
 {
-	if (text().size())
+	if (text().size() && !text().startsWith(SearchMatch::FULLTEXT_SEARCH_CHARACTER))
 	{
 		MessageSearchAutocomplete(text().toStdString()).dispatch();
 	}