patch 8.1.1587: redraw problem when sign icons in the number column

Problem:    Redraw problem when sign icons in the number column.
Solution:   Clear and redraw when changing related options.  Right aligh the
            sign icon in the GUI. (Yegappan Lakshmanan, closes #4578)
diff --git a/src/gui.c b/src/gui.c
index 5689182..634f3fb 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -2253,6 +2253,7 @@
     int		col = gui.col;
 #ifdef FEAT_SIGN_ICONS
     int		draw_sign = FALSE;
+    int		signcol = 0;
     char_u	extra[18];
 # ifdef FEAT_NETBEANS_INTG
     int		multi_sign = FALSE;
@@ -2287,6 +2288,8 @@
 	if (len == 1 && col > 0)
 	    --col;
 	len = (int)STRLEN(s);
+	if (len > 2)
+	    signcol = len - 3;	// Right align sign icon in the number column
 	draw_sign = TRUE;
 	highlight_mask = 0;
     }
@@ -2612,7 +2615,7 @@
 #ifdef FEAT_SIGN_ICONS
     if (draw_sign)
 	/* Draw the sign on top of the spaces. */
-	gui_mch_drawsign(gui.row, col, gui.highlight_mask);
+	gui_mch_drawsign(gui.row, signcol, gui.highlight_mask);
 # if defined(FEAT_NETBEANS_INTG) && (defined(FEAT_GUI_X11) \
 	|| defined(FEAT_GUI_GTK) || defined(FEAT_GUI_MSWIN))
     if (multi_sign)
diff --git a/src/option.c b/src/option.c
index a1cddcf..941ea66 100644
--- a/src/option.c
+++ b/src/option.c
@@ -1985,7 +1985,7 @@
 			    (char_u *)&p_nf, PV_NF,
 			    {(char_u *)"bin,octal,hex", (char_u *)0L}
 			    SCTX_INIT},
-    {"number",	    "nu",   P_BOOL|P_VI_DEF|P_RWIN,
+    {"number",	    "nu",   P_BOOL|P_VI_DEF|P_RCLR,
 			    (char_u *)VAR_WIN, PV_NU,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"numberwidth", "nuw",  P_NUM|P_RWIN|P_VIM,
@@ -2252,7 +2252,7 @@
     {"regexpengine", "re",  P_NUM|P_VI_DEF,
 			    (char_u *)&p_re, PV_NONE,
 			    {(char_u *)0L, (char_u *)0L} SCTX_INIT},
-    {"relativenumber", "rnu", P_BOOL|P_VI_DEF|P_RWIN,
+    {"relativenumber", "rnu", P_BOOL|P_VI_DEF|P_RCLR,
 			    (char_u *)VAR_WIN, PV_RNU,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"remap",	    NULL,   P_BOOL|P_VI_DEF,
@@ -2497,7 +2497,7 @@
     {"sidescrolloff", "siso", P_NUM|P_VI_DEF|P_VIM|P_RBUF,
 			    (char_u *)&p_siso, PV_SISO,
 			    {(char_u *)0L, (char_u *)0L} SCTX_INIT},
-    {"signcolumn",   "scl",  P_STRING|P_ALLOCED|P_VI_DEF|P_RWIN,
+    {"signcolumn",   "scl",  P_STRING|P_ALLOCED|P_VI_DEF|P_RCLR,
 #ifdef FEAT_SIGNS
 			    (char_u *)VAR_WIN, PV_SCL,
 			    {(char_u *)"auto", (char_u *)0L}
diff --git a/src/version.c b/src/version.c
index 9d2f26c..37f9e61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1587,
+/**/
     1586,
 /**/
     1585,