bsddialog: Fix widget_maxsize to only take into account window decor

For the height this doesn't matter unless auto_minheight is non-zero,
but for the width it does, as it would subtract off the maximum of
various things including the text width, which is clearly nonsense here.
All we want to do is compute how much space for content there is; what's
on other lines doesn't matter.

Fixes:	64f7073 ("bsddialog: Optionally truncate long mixedgauge labels and screens")

contrib/bsddialog/lib/lib_util.c

@@ -68,6 +68,8 @@
  * [static] text_properties();
  * [static] text_autosize();
  * [static] text_size();
+ * [static] widget_decor_height(htext, hnotext, bool buttons);
+ * [static] widget_decor_width();
  * [static] widget_min_height(conf, htext, hnotext, bool buttons);
  * [static] widget_min_width(conf, wtext, minw, buttons);
  *          set_widget_size();
@@ -755,23 +757,44 @@ text_size(struct bsddialog_conf *conf, int rows, int cols, const char *text,
 }
 
 static int
-widget_min_height(struct bsddialog_conf *conf, int htext, int hnotext,
-    bool withbuttons)
+widget_decor_height(int htext, int hnotext, bool withbuttons)
 {
-	int min;
+	int h;
 
 	/* dialog borders */
-	min = BORDERS;
+	h = BORDERS;
 
 	/* text */
-	min += htext;
+	h += htext;
 
 	/* specific widget lines without text */
-	min += hnotext;
+	h += hnotext;
 
 	/* buttons */
 	if (withbuttons)
-		min += HBUTTONS; /* buttons and their up-border */
+		h += HBUTTONS; /* buttons and their up-border */
+
+	return (h);
+}
+
+static int
+widget_decor_width(void)
+{
+	int w;
+
+	/* dialog borders */
+	w = BORDERS;
+
+	return (w);
+}
+
+static int
+widget_min_height(struct bsddialog_conf *conf, int htext, int hnotext,
+    bool withbuttons)
+{
+	int min;
+
+	min = widget_decor_height(htext, hnotext, withbuttons);
 
 	/* conf.auto_minheight */
 	min = MAX(min, (int)conf->auto_minheight);
@@ -812,8 +835,7 @@ widget_min_width(struct bsddialog_conf *conf, int wtext, int minwidget,
 		min = MAX(min, wbottomtitle + 4);
 	}
 
-	/* dialog borders */
-	min += BORDERS;
+	min += widget_decor_width();
 	/* conf.auto_minwidth */
 	min = MAX(min, (int)conf->auto_minwidth);
 
@@ -895,21 +917,17 @@ int widget_maxsize(struct bsddialog_conf *conf, int rows, int cols, int *maxh,
 	if (text_size(conf, rows, cols, text, bs, 0, 0, &htext, &wtext) != 0)
 		return (BSDDIALOG_ERROR);
 
-	/*
-	 * XXX: Should possibly clear conf->auto_min{height,width}
-	 * temporarily.
-	 */
 	minheight = widget_min_height(conf, htext, 0, bs->nbuttons > 0);
 	if (h < minheight)
 		RETURN_FMTERROR("Current rows: %d, needed at least: %d",
 		    h, minheight);
-	*maxh = h - minheight;
+	*maxh = h - widget_decor_height(htext, 0, bs->nbuttons > 0);
 
 	minwidth = widget_min_width(conf, wtext, 0, bs);
 	if (w < minwidth)
 		RETURN_FMTERROR("Current cols: %d, needed at least %d",
 		    w, minwidth);
-	*maxw = w - minwidth;
+	*maxw = w - widget_decor_width();
 
 	return (0);
 }