Refactor `button & ~MOD_MASK' as `STRIP_BUTTON_MODIFIERS(button)'.

This refactors all instances of bitwise-ANDs with `~MOD_MASK'. There is
a handful of more complex instances I left unchanged (in cube.c, midend.c,
and twiddle.c), since those AND with `~MOD_MASK | MOD_NUM_KEYPAD' or
similar. I don't think it's worth writing a macro for those cases.

Also document this new macro's usage in devel.but.

1 files changed, 1 insertions, 1 deletions

diff --git a/loopy.c b/loopy.c
index 7d79876..b30dd68 100644
--- a/loopy.c
+++ b/loopy.c
@@ -3048,7 +3048,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     char button_char = ' ';
     enum line_state old_state;
 
-    button &= ~MOD_MASK;
+    button = STRIP_BUTTON_MODIFIERS(button);
 
     /* Convert mouse-click (x,y) to grid coordinates */
     x -= BORDER(ds->tilesize);