Keyboard shortcuts in Filer_Action

I’m adding keyboard shortcuts to Filer_Action. My current solution is to have a FA window given the input focus if (and only if) it was opened by the user using a keypress in a Filer window.

I’ve implemented this by adding a new flag bit to r2 of FilerAction_SendStartOperation (and hence to the flags word at offset 24 of Message_FilerAction).

The current flag bits are therefore:
0 – verbose
1 – confirm
2- force
3 – newer
4 – recurse
5 – confirm deletes
6 – faster
7 – grab focus (new)

If bit 7 is set, FilerAction will claim the input focus when its window opens for the first time.

The Filer should set this bit if a keyboard shortcut is used – currently only CTRL-K (delete) has this effect.

Any comments? Is this likely to break anything? Feedback here please before I commit the changes.