Add origin-shifting (Shift+cursors) and source-shifting (Ctrl+cursors) to Net.

(Adding modifier+cursors handling has had minor knock-on effects on the other
puzzles, so that they can continue to ignore modifiers.)

(An unfortunate side effect of this is some artifacts in exterior barrier
drawing; notably, a disconnected corner can now appear at the corner of the
grid under some circumstances. I haven't found a satisfactory way round
this yet.)

[originally from svn r5844]

1 files changed, 2 insertions, 0 deletions

diff --git a/rect.c b/rect.c
index 848dcd3..76abeed 100644
--- a/rect.c
+++ b/rect.c
@@ -2127,6 +2127,8 @@ static game_state *make_move(game_state *from, game_ui *ui,
     int startdrag = FALSE, enddrag = FALSE, active = FALSE;
     game_state *ret;
 
+    button &= ~MOD_MASK;
+
     if (button == LEFT_BUTTON) {
         startdrag = TRUE;
     } else if (button == LEFT_RELEASE) {