Pearl: slightly better handling of clicks outside the grid

In Pearl, a mouse-down outside the grid sets ui->ndragcoords to -1.
The intended effect of this is to make sure that future drags are
ignored, so you can't try to draw a line starting off the grid.
However, this also has the effect of clearing any in-progress drag.
This can happen if there's a keyboard "drag" in progress at the time.

This is arguably wrong, but much more wrong was that interpret_move
returned MOVE_UNUSED (and previously NULL) in this case.  That meant
that the display didn't get updated to show the abandonment of the
drag, or the removal of the keyboard cursor that also happened.  This
commit changes MOVE_UNUSED to MOVE_UI_UPDATE so that at least the
effect is correctly visible.

1 files changed, 1 insertions, 1 deletions

diff --git a/pearl.c b/pearl.c
index 34abf2a..402273f 100644
--- a/pearl.c
+++ b/pearl.c
@@ -2175,7 +2175,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         if (!INGRID(state, gx, gy)) {
             ui->ndragcoords = -1;
-            return MOVE_UNUSED;
+            return MOVE_UI_UPDATE;
         }
 
         ui->clickx = x; ui->clicky = y;