Add shortcuts for using user's preferred fixed font in MiniQtHelper

qrenderdoc/Code/Interface/Extensions.h

@@ -711,6 +711,9 @@ this will do nothing
 
   DOCUMENT(R"(Change the font properties of a widget.
 
+The font string can be set either to '_default' or '_fixed' to choose the user-selected default
+font or monospaced fonts respectively.
+
 :param QWidget widget: The widget to change font of.
 :param str font: The new font family to use, or an empty string to leave the font family the same.
 :param int fontSize: The new font point size to use, or 0 to leave the size the same.

qrenderdoc/Code/MiniQtHelper.cpp

@@ -439,10 +439,16 @@ void MiniQtHelper::SetWidgetFont(QWidget *widget, const rdcstr &font, int32_t fo
   if(!widget)
     return;
 
+  QString fontFamily = font;
+  if(font == "_default")
+    fontFamily = Formatter::PreferredFont().family();
+  if(font == "_fixed")
+    fontFamily = Formatter::FixedFont().family();
+
   QFont f = widget->font();
 
-  if(!font.empty())
-    f.setFamily(font);
+  if(!fontFamily.isEmpty())
+    f.setFamily(fontFamily);
   if(fontSize != 0)
     f.setPointSize(fontSize);
   f.setBold(bold);