fix source view button's style on windows and linux
fix source view button's style on windows
and linux

therealglazou/bluegriffon,therealglazou/bluegriffon,therealglazou/bluegriffon,therealglazou/bluegriffon,therealglazou/bluegriffon,therealglazou/bluegriffon,therealglazou/bluegriffon