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Stop Light Up from eating system keypresses, which it was previously
doing whenever the cursor was active.

[originally from svn r6258]

--- a/lightup.c

+++ b/lightup.c

@@ -1824,11 +1824,13 @@

 			    int x, int y, int button)

 {

     enum { NONE, FLIP_LIGHT, FLIP_IMPOSSIBLE } action = NONE;

-    int cx = -1, cy = -1, cv = ui->cur_visible;

+    int cx = -1, cy = -1;

     unsigned int flags;

-    char buf[80], *nullret, *empty = "", c;

+    char buf[80], *nullret = NULL, *empty = "", c;

     if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {

+        if (ui->cur_visible)

+            nullret = empty;

         ui->cur_visible = 0;

         cx = FROMCOORD(x);

         cy = FROMCOORD(y);

@@ -1855,13 +1857,9 @@

         ui->cur_x = min(max(ui->cur_x, 0), state->w - 1);

         ui->cur_y = min(max(ui->cur_y, 0), state->h - 1);

         ui->cur_visible = 1;

-    }

-

-    /* Always redraw if the cursor is on, or if it's just been

-     * removed. */

-    if (ui->cur_visible) nullret = empty;

-    else if (cv) nullret = empty;

-    else nullret = NULL;

+        nullret = empty;

+    } else

+        return NULL;

     switch (action) {

     case FLIP_LIGHT:

-- 

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