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.cc b/src/ButtonTool.cc
index 0e11733..ad54534 100644
--- a/src/ButtonTool.cc
+++ b/src/ButtonTool.cc
@@ -49,7 +49,7 @@ void ButtonTool::updateSizing() {
     btn.setBorderWidth(theme()->border().width());
 }
 
-void ButtonTool::renderTheme(unsigned char alpha) {
+void ButtonTool::renderTheme(int alpha) {
     FbTk::Button &btn = static_cast<FbTk::Button &>(window());
 
     btn.setGC(static_cast<const ButtonTheme &>(*theme()).gc());