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Fix Bridges keyboard cursor vertical out-of-bounds error.

Position the cursor in the top (bottom) row, press enter and press up
(down).  The game acts as if you had pressed right, both with Enter-
and Space-based dragging.

--- a/bridges.c

+++ b/bridges.c

@@ -2376,6 +2376,8 @@

             int nx = ui->cur_x, ny = ui->cur_y;

             move_cursor(button, &nx, &ny, state->w, state->h, 0);

+            if (nx == ui->cur_x && ny == ui->cur_y)

+                return NULL;

             update_drag_dst(state, ui, ds,

                              COORD(nx)+TILE_SIZE/2,

                              COORD(ny)+TILE_SIZE/2);