Privacy mode, msgbox, add details

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/platform/linux.rs

@@ -627,8 +627,8 @@ pub fn toggle_blank_screen(_v: bool) {
     // https://unix.stackexchange.com/questions/17170/disable-keyboard-mouse-input-on-unix-under-x
 }
 
-pub fn block_input(_v: bool) -> bool {
-    true
+pub fn block_input(_v: bool) -> (bool, String) {
+    (true, "".to_owned())
 }
 
 pub fn is_installed() -> bool {