ui: Add ability to use shift and xshift for transalpha

It is not possible to shift or double shift before using transalpha in
order to get the extra characters. Note that the order matters, you
need to set the shift first.

Signed-off-by: Christophe de Dinechin <[email protected]>

Author: c3d

src/user_interface.cc

@@ -673,7 +673,7 @@ bool user_interface::key(int key, bool repeating, bool talpha)
     if (rt.editing())
         update_mode();
 
-    if (!skey && last != KEY_SHIFT)
+    if (!skey && last != KEY_SHIFT && !transalpha)
     {
         shift = false;
         xshift = false;
@@ -4120,6 +4120,10 @@ bool user_interface::noHelpForKey(int key)
             return true;
     }
 
+    // No help for shifted UP/DOWN (history, edit, etc)
+    if (key == KEY_UP || key == KEY_DOWN)
+        return true;
+
     // Other cases are regular functions, we can display help
     return false;
 }