AutoTest: Handle resizing appropriate

When the user resizes QC and has a test result selected which
contains multiple lines these lines will be re-evaluated
and may now end up in having more or less lines than before.
We need to inform the UI that this caused a change of the
needed size otherwise we end up in omitting lines or adding
empty lines.

Task-number: QTCREATORBUG-26122
Change-Id: I91b0271975f8f0fff128ef7cf6c74947c0162ea9
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/autotest/testresultdelegate.cpp

@@ -183,9 +183,12 @@ void TestResultDelegate::currentChanged(const QModelIndex &current, const QModel
 
 void TestResultDelegate::clearCache()
 {
+    const QModelIndex current = m_lastProcessedIndex;
     m_lastProcessedIndex = QModelIndex();
     m_lastProcessedFont = QFont();
     m_lastWidth = -1;
+    if (current.isValid())
+        emit sizeHintChanged(current);
 }
 
 void TestResultDelegate::recalculateTextLayout(const QModelIndex &index, const QString &output,

src/plugins/autotest/testresultspane.cpp

@@ -166,6 +166,7 @@ TestResultsPane::TestResultsPane(QObject *parent) :
             this, &TestResultsPane::addTestResult);
     connect(TestRunner::instance(), &TestRunner::hadDisabledTests,
             m_model, &TestResultModel::raiseDisabledTests);
+    visualOutputWidget->installEventFilter(this);
 }
 
 void TestResultsPane::createToolButtons()
@@ -576,6 +577,14 @@ void TestResultsPane::filterMenuTriggered(QAction *action)
     navigateStateChanged();
 }
 
+bool TestResultsPane::eventFilter(QObject *object, QEvent *event)
+{
+    QTC_ASSERT(m_outputWidget, return false);
+    if (event->type() == QEvent::Resize && object->parent() == m_outputWidget)
+        static_cast<TestResultDelegate *>(m_treeView->itemDelegate())->clearCache();
+    return false;
+}
+
 void TestResultsPane::onTestRunStarted()
 {
     m_testRunning = true;

src/plugins/autotest/testresultspane.h

@@ -105,6 +105,7 @@ private:
     void onRunSelectedTriggered();
     void checkAllFilter(bool checked);
     void filterMenuTriggered(QAction *action);
+    bool eventFilter(QObject *object, QEvent *event) override;
 
     void initializeFilterMenu();
     void updateSummaryLabel();