bugfix: consistent use of 'int' for alpha values (#3187373)

WindowMenuAccessor returned strange alpha values if compiled
with 'g++ -Os'; unholy black magic happens if template<int> faces
functions returning only 'usigned char'.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ButtonTool.hh b/src/ButtonTool.hh
index 484fea6..ec74618 100644
--- a/src/ButtonTool.hh
+++ b/src/ButtonTool.hh
@@ -41,7 +41,7 @@ public:
     virtual ~ButtonTool();
 
 protected:
-    void renderTheme(unsigned char alpha);
+    void renderTheme(int alpha);
     void updateSizing();
     Pixmap m_cache_pm, m_cache_pressed_pm;
     FbTk::ImageControl &m_image_ctrl;