Add new solution for context links that does not force regular markdown (#938)

in responses which is disruptive to code completions in responses.

gpt4all-chat/responsetext.h

@@ -0,0 +1,63 @@
+#ifndef RESPONSETEXT_H
+#define RESPONSETEXT_H
+
+#include <QObject>
+#include <QQmlEngine>
+#include <QQuickTextDocument>
+#include <QSyntaxHighlighter>
+#include <QRegularExpression>
+
+struct HighlightingRule
+{
+    QRegularExpression pattern;
+    QTextCharFormat format;
+};
+
+class SyntaxHighlighter : public QSyntaxHighlighter {
+    Q_OBJECT
+public:
+    SyntaxHighlighter(QObject *parent);
+    ~SyntaxHighlighter();
+
+    void highlightBlock(const QString &text) override;
+
+private:
+    QVector<HighlightingRule> m_highlightingRules;
+};
+
+struct ContextLink {
+    int startPos = -1;
+    int endPos = -1;
+    QString text;
+    QString href;
+};
+
+class ResponseText : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QQuickTextDocument* textDocument READ textDocument WRITE setTextDocument NOTIFY textDocumentChanged())
+    QML_ELEMENT
+public:
+    explicit ResponseText(QObject *parent = nullptr);
+
+    QQuickTextDocument* textDocument() const;
+    void setTextDocument(QQuickTextDocument* textDocument);
+
+    Q_INVOKABLE void setLinkColor(const QColor &c) { m_linkColor = c; }
+    Q_INVOKABLE QString getLinkAtPosition(int position) const;
+
+Q_SIGNALS:
+    void textDocumentChanged();
+
+private Q_SLOTS:
+    void handleTextChanged();
+
+private:
+    QQuickTextDocument *m_textDocument;
+    SyntaxHighlighter *m_syntaxHighlighter;
+    QVector<ContextLink> m_links;
+    QColor m_linkColor;
+    bool m_isProcessingText = false;
+};
+
+#endif // RESPONSETEXT_H