[LyX/master] Improve some debug messages

[Jean-Marc Lasgouttes]

commit c68be9a9be4b397825bf2b9844d25ad79f03dc96
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Thu Nov 26 11:04:33 2020 +0100

    Improve some debug messages
    
    The current code did not give much information.
    
    I am not sure why the <<FontInfo operator is not defined in
    FontInfo.h, but I figured that it was not necessary to understand that
    now.
---
 src/Font.h                         |    3 +++
 src/frontends/qt/GuiFontLoader.cpp |    4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Font.h b/src/Font.h
index fdcdb7d..b59f015 100644
--- a/src/Font.h
+++ b/src/Font.h
@@ -119,6 +119,9 @@ private:
 	mutable bool open_encoding_;
 };
 
+///
+std::ostream & operator<<(std::ostream & os, FontInfo const & f);
+
 
 ///
 inline
diff --git a/src/frontends/qt/GuiFontLoader.cpp b/src/frontends/qt/GuiFontLoader.cpp
index 80d45f6..a2d6d98 100644
--- a/src/frontends/qt/GuiFontLoader.cpp
+++ b/src/frontends/qt/GuiFontLoader.cpp
@@ -14,7 +14,7 @@
 #include "GuiFontLoader.h"
 
 #include "FontLoader.h"
-#include "FontInfo.h"
+#include "Font.h"
 #include "GuiFontMetrics.h"
 #include "qt_helpers.h"
 
@@ -129,8 +129,8 @@ GuiFontInfo & fontinfo(FontInfo const & f)
             (f.size() < NUM_SIZE);
     if (!fontIsRealized) {
         // We can reset the font to something sensible in release mode.
+        LYXERR0("Unrealized font!" << f);
         LATTEST(false);
-        LYXERR0("Unrealized font!");
         FontInfo f2 = f;
         f2.realize(sane_font);
         GuiFontInfo * & fi = fontinfo_ptr(f2);