[gtkmm] Doxyfile.in: Allow more graph nodes

[Kjell Ahlstedt <kjellahl src gnome org>]

commit ad24e7455b68a1af47a214f4713ebe444726b7f0
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Wed Jul 13 11:07:53 2022 +0200

    Doxyfile.in: Allow more graph nodes
    
    Required for Gtk::Widget's inheritance diagram.

 docs/reference/Doxyfile.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/docs/reference/Doxyfile.in b/docs/reference/Doxyfile.in
index 1eb35495..afff4936 100644
--- a/docs/reference/Doxyfile.in
+++ b/docs/reference/Doxyfile.in
@@ -344,7 +344,7 @@ MSCFILE_DIRS           =
 DIAFILE_DIRS           =
 PLANTUML_JAR_PATH      =
 PLANTUML_INCLUDE_PATH  =
-DOT_GRAPH_MAX_NODES    = 50
+DOT_GRAPH_MAX_NODES    = 150
 MAX_DOT_GRAPH_DEPTH    = 0
 DOT_TRANSPARENT        = NO
 DOT_MULTI_TARGETS      = YES