Use the rich text char format to store mentions rather than a separate structure in ChatBarCache.

This removes mentions from ChatBarCache and instead sets mentions as an anchor using the QTextCursor. Saving and restoring the chatbar text content is then done using QTextDocumentFragments which retain the rich text formatting.

src/libneochat/chattextitemhelper.h

@@ -5,6 +5,8 @@
 
 #include <QObject>
 #include <QQuickItem>
+#include <QTextDocumentFragment>
+#include <qtextdocumentfragment.h>
 
 #include "enums/chatbartype.h"
 #include "enums/richformat.h"
@@ -108,16 +110,16 @@ public:
     void setFixedChars(const QString &startChars, const QString &endChars);
 
     /**
-     * @brief Any text to initialise the text item with when set.
+     * @brief Any QTextDocumentFragment to initialise the text item with when set.
      */
-    QString initialText() const;
+    QTextDocumentFragment initialFragment() const;
 
     /**
-     * @brief Set the text to initialise the text item with when set.
+     * @brief Set the QTextDocumentFragment to initialise the text item with when set.
      *
      * This text will only be set if the text item is empty when set.
      */
-    void setInitialText(const QString &text);
+    void setInitialFragment(const QTextDocumentFragment &fragment);
 
     /**
      * @brief The underlying QTextDocument.
@@ -248,6 +250,11 @@ public:
      */
     QString plainText() const;
 
+    /**
+     * @brief Output the text in the text item as a QTextDocumentFragment.
+     */
+    QTextDocumentFragment toFragment() const;
+
 Q_SIGNALS:
     /**
      * @brief Emitted when the NeoChatRoom used by the syntax highlighter is changed.
@@ -309,8 +316,8 @@ private:
 
     QString m_fixedStartChars = {};
     QString m_fixedEndChars = {};
-    QString m_initialText = {};
-    void initializeChars();
+    QTextDocumentFragment m_initialFragment = {};
+    void initialize();
     bool m_initializingChars = false;
 
     std::optional<int> lineLength(int lineNumber) const;