ui: Fixed search related issues

* select elements when clicking into search bar
* fixed crash and single file mode clearing when fulltext search yields no results

src/lib/component/controller/CodeController.cpp

@@ -402,6 +402,11 @@ void CodeController::expandVisibleSnippets(std::vector<CodeSnippetParams>* snipp
 {
 	TRACE();
 
+	if (!snippets->size())
+	{
+		return;
+	}
+
 	bool inListMode = getView()->isInListMode();
 
 	size_t filesToExpand = inListMode ? std::min(int(snippets->size()), 3) : 1;

src/lib_gui/qt/element/QtCodeFileSingle.cpp

@@ -76,9 +76,14 @@ QAbstractScrollArea* QtCodeFileSingle::getScrollArea()
 	return m_area;
 }
 
-void QtCodeFileSingle::clearCache()
+void QtCodeFileSingle::clearFile()
 {
 	setFileData(FileData());
+}
+
+void QtCodeFileSingle::clearCache()
+{
+	clearFile();
 
 	m_fileDatas.clear();
 	m_filePaths.clear();

src/lib_gui/qt/element/QtCodeFileSingle.h

@@ -27,6 +27,7 @@ public:
 	QtCodeFileSingle(QtCodeNavigator* navigator, QWidget* parent = nullptr);
 	virtual ~QtCodeFileSingle();
 
+	void clearFile();
 	void clearCache();
 
 	// QtCodeNaviatebale implementation

src/lib_gui/qt/element/QtCodeNavigator.cpp

@@ -257,6 +257,11 @@ void QtCodeNavigator::clearCodeSnippets()
 	m_singleHasNewFile = false;
 }
 
+void QtCodeNavigator::clearFile()
+{
+	m_single->clearFile();
+}
+
 void QtCodeNavigator::clearCaches()
 {
 	m_single->clearCache();

src/lib_gui/qt/element/QtCodeNavigator.h

@@ -41,6 +41,7 @@ public:
 
 	void clear();
 	void clearCodeSnippets();
+	void clearFile();
 	void clearCaches();
 
 	const std::set<Id>& getCurrentActiveTokenIds() const;

src/lib_gui/qt/element/QtSmartSearchBox.cpp

@@ -88,6 +88,7 @@ QtSmartSearchBox::QtSmartSearchBox(QWidget* parent)
 	, m_cursorIndex(0)
 	, m_shiftKeyDown(false)
 	, m_mousePressed(false)
+	, m_ignoreNextMousePress(false)
 {
 	m_highlightRect = new QWidget(this);
 	m_highlightRect->setGeometry(0, 0, 0, 0);
@@ -150,17 +151,6 @@ void QtSmartSearchBox::setMatches(const std::vector<SearchMatch>& matches)
 void QtSmartSearchBox::setFocus()
 {
 	QLineEdit::setFocus(Qt::ShortcutFocusReason);
-
-	if (text().size() == 1 && text().startsWith(SearchMatch::FULLTEXT_SEARCH_CHARACTER))
-	{
-		setEditText("");
-	}
-	else
-	{
-		editTextToElement();
-		selectAllElementsWith(true);
-		layoutElements();
-	}
 }
 
 void QtSmartSearchBox::findFulltext()
@@ -214,6 +204,32 @@ void QtSmartSearchBox::resizeEvent(QResizeEvent* event)
 	layoutElements();
 }
 
+void QtSmartSearchBox::focusInEvent(QFocusEvent* event)
+{
+	QLineEdit::focusInEvent(event);
+
+	if (event->reason() != Qt::MouseFocusReason && event->reason() != Qt::ShortcutFocusReason)
+	{
+		return;
+	}
+
+	if (text().size() == 1 && text().startsWith(SearchMatch::FULLTEXT_SEARCH_CHARACTER))
+	{
+		setEditText("");
+	}
+	else
+	{
+		editTextToElement();
+		selectAllElementsWith(true);
+		layoutElements();
+	}
+
+	if (event->reason() == Qt::MouseFocusReason)
+	{
+		m_ignoreNextMousePress = true;
+	}
+}
+
 void QtSmartSearchBox::keyPressEvent(QKeyEvent* event)
 {
 	m_shiftKeyDown = event->modifiers() & Qt::ShiftModifier;
@@ -436,14 +452,24 @@ void QtSmartSearchBox::mousePressEvent(QMouseEvent* event)
 {
 	QLineEdit::mousePressEvent(event);
 
-	m_mousePressed = true;
-	m_mouseX = event->x();
+	if (!m_ignoreNextMousePress)
+	{
+		m_mousePressed = true;
+		m_mouseX = event->x();
+	}
+
+	m_ignoreNextMousePress = false;
 }
 
 void QtSmartSearchBox::mouseReleaseEvent(QMouseEvent* event)
 {
 	QLineEdit::mouseReleaseEvent(event);
 
+	if (!m_mousePressed)
+	{
+		return;
+	}
+
 	m_mousePressed = false;
 
 	if (abs(event->x() - m_mouseX) > 5)

src/lib_gui/qt/element/QtSmartSearchBox.h

@@ -51,6 +51,8 @@ public:
 protected:
 	virtual bool event(QEvent *event);
 	virtual void resizeEvent(QResizeEvent* event);
+	virtual void focusInEvent(QFocusEvent* event);
+
 	virtual void keyPressEvent(QKeyEvent* event);
 	virtual void keyReleaseEvent(QKeyEvent* event);
 
@@ -112,6 +114,7 @@ private:
 	bool m_shiftKeyDown;
 	bool m_mousePressed;
 	int m_mouseX;
+	bool m_ignoreNextMousePress;
 
 	QWidget* m_highlightRect;
 	QtAutocompletionList* m_completer;

src/lib_gui/qt/view/QtCodeView.cpp

@@ -72,6 +72,11 @@ void QtCodeView::showCodeSnippets(const std::vector<CodeSnippetParams>& snippets
 
 			m_widget->setActiveTokenIds(params.activeTokenIds);
 			m_widget->setErrorInfos(params.errorInfos);
+
+			if (!snippets.size())
+			{
+				m_widget->clearFile();
+			}
 		}
 
 		bool addedFiles = false;