fix(viewing): replace font metrics with document renderer

Upgrade the height computation mechanism to utilize QTextDocument
instead of QFontMetrics. This change accommodates HTML formatting in
the license display and adjusts minimum dimensions to improve visual
proportions across different content volumes.

log: replace font metrics with document renderer
pms: BUG-314073

Author: add-uos

dde-license-dialog/src/content.cpp

@@ -21,6 +21,7 @@
 #include <QtConcurrent>
 #include <QThread>
 #include <QTranslator>
+#include <QTextDocument>
 
 #include <unistd.h>
 
@@ -278,10 +279,11 @@ void Content::updateContent()
 // 根据文本多少，调整窗口大小
 void Content::updateWindowHeight()
 {
-    QRect rc = m_source->rect();
-    rc.setWidth(rc.width() - 40);
-    QSize sz = m_source->fontMetrics().boundingRect(rc, Qt::TextWordWrap, m_source->text()).size();
-
-    int minHeight = qBound(300, sz.height(), 491);
+    QTextDocument doc;
+    doc.setHtml(m_source->text());
+    doc.setTextWidth(m_scrollArea->width() - 40);
+    
+    int contentHeight = static_cast<int>(doc.size().height());
+    int minHeight = qBound(100, contentHeight, 491);
     m_scrollArea->setMinimumHeight(minHeight);
 }