patch 8.0.1790: 'winfixwidth' is not always respected by :close

Problem:    'winfixwidth' is not always respected by :close.
Solution:   Prefer a frame without 'winfixwidth' or 'winfixheight'. (Jason
            Franklin)
diff --git a/src/window.c b/src/window.c
index 333663b..d3ec4cd 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2740,12 +2740,14 @@
 }
 
 /*
- * Find out which frame is going to get the freed up space when "win" is
- * closed.
- * if 'splitbelow'/'splitleft' the space goes to the window above/left.
- * if 'nosplitbelow'/'nosplitleft' the space goes to the window below/right.
- * This makes opening a window and closing it immediately keep the same window
- * layout.
+ * Return a pointer to the frame that will receive the empty screen space that
+ * is left over after "win" is closed.
+ *
+ * If 'splitbelow' or 'splitright' is set, the space goes above or to the left
+ * by default.  Otherwise, the free space goes below or to the right.  The
+ * result is that opening a window and then immediately closing it will
+ * preserve the initial window layout.  The 'wfh' and 'wfw' settings are
+ * respected when possible.
  */
     static frame_T *
 win_altframe(
@@ -2753,20 +2755,40 @@
     tabpage_T	*tp)		/* tab page "win" is in, NULL for current */
 {
     frame_T	*frp;
-    int		b;
+    frame_T	*other_fr, *target_fr;
 
     if (tp == NULL ? ONE_WINDOW : tp->tp_firstwin == tp->tp_lastwin)
-	/* Last window in this tab page, will go to next tab page. */
 	return alt_tabpage()->tp_curwin->w_frame;
 
     frp = win->w_frame;
-    if (frp->fr_parent != NULL && frp->fr_parent->fr_layout == FR_ROW)
-	b = p_spr;
-    else
-	b = p_sb;
-    if ((!b && frp->fr_next != NULL) || frp->fr_prev == NULL)
+
+    if (frp->fr_prev == NULL)
 	return frp->fr_next;
-    return frp->fr_prev;
+    if (frp->fr_next == NULL)
+	return frp->fr_prev;
+
+    target_fr = frp->fr_next;
+    other_fr  = frp->fr_prev;
+    if (p_spr || p_sb)
+    {
+	target_fr = frp->fr_prev;
+	other_fr  = frp->fr_next;
+    }
+
+    /* If 'wfh' or 'wfw' is set for the target and not for the alternate
+     * window, reverse the selection. */
+    if (frp->fr_parent != NULL && frp->fr_parent->fr_layout == FR_ROW)
+    {
+	if (frame_fixed_width(target_fr) && !frame_fixed_width(other_fr))
+	    target_fr = other_fr;
+    }
+    else
+    {
+	if (frame_fixed_height(target_fr) && !frame_fixed_height(other_fr))
+	    target_fr = other_fr;
+    }
+
+    return target_fr;
 }
 
 /*