LanguageClient: Add "Clear" button to LSP inspector

It's helpful to be able to watch new messages from a certain point
onwards, and not be distracted by older ones.

Change-Id: I0506dad24d4b970652117d7e704ebfb4b49cad74
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/languageclient/lspinspector.cpp

@@ -42,6 +42,7 @@
 #include <QLabel>
 #include <QListWidget>
 #include <QPlainTextEdit>
+#include <QPushButton>
 #include <QSplitter>
 #include <QStyledItemDelegate>
 #include <QTextCodec>
@@ -427,6 +428,11 @@ LspInspectorWidget::LspInspectorWidget(LspInspector *inspector)
 
     auto buttonBox = new QDialogButtonBox(this);
     buttonBox->setStandardButtons(QDialogButtonBox::Save | QDialogButtonBox::Close);
+    const auto clearButton = buttonBox->addButton(tr("Clear"), QDialogButtonBox::ResetRole);
+    connect(clearButton, &QPushButton::clicked, this, [this] {
+        m_inspector->clear();
+        currentClientChanged(m_clients->currentItem()->text());
+    });
     mainLayout->addWidget(buttonBox);
     setLayout(mainLayout);
 

src/plugins/languageclient/lspinspector.h

@@ -85,6 +85,7 @@ public:
     std::list<LspLogMessage> messages(const QString &clientName) const;
     Capabilities capabilities(const QString &clientName) const;
     QList<QString> clients() const;
+    void clear() { m_logs.clear(); }
 
 signals:
     void newMessage(const QString &clientName, const LspLogMessage &message);