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/GenericTool.hh b/src/GenericTool.hh
index b64edcf..5d7c8d4 100644
--- a/src/GenericTool.hh
+++ b/src/GenericTool.hh
@@ -60,7 +60,7 @@ public:
     const FbTk::FbWindow &window() const { return *m_window; }
 
 protected:
-    virtual void renderTheme(unsigned char alpha);
+    virtual void renderTheme(int alpha);
 
 private:
     void update(FbTk::Subject *subj);