patch 8.1.0058: display problem with margins and scrolling

Problem:    Display problem with margins and scrolling.
Solution:   Place the cursor in the right column. (Kouichi Iwamoto,
            closes #3016)

src/screen.c

@@ -9797,6 +9797,7 @@ screen_ins_lines(
     int		j;
     unsigned	temp;
     int		cursor_row;
+    int		cursor_col = 0;
     int		type;
     int		result_empty;
     int		can_ce = can_clear(T_CE);
@@ -9893,6 +9894,9 @@ screen_ins_lines(
     gui_dont_update_cursor(row + off <= gui.cursor_row);
 #endif
 
+    if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)
+	cursor_col = wp->w_wincol;
+
     if (*T_CCS != NUL)	   /* cursor relative to region */
 	cursor_row = row;
     else
@@ -9939,7 +9943,7 @@ screen_ins_lines(
     }
 
     screen_stop_highlight();
-    windgoto(cursor_row, 0);
+    windgoto(cursor_row, cursor_col);
     if (clear_attr != 0)
 	screen_start_highlight(clear_attr);
 
@@ -9958,7 +9962,7 @@ screen_ins_lines(
 	    if (type == USE_T_AL)
 	    {
 		if (i && cursor_row != 0)
-		    windgoto(cursor_row, 0);
+		    windgoto(cursor_row, cursor_col);
 		out_str(T_AL);
 	    }
 	    else  /* type == USE_T_SR */
@@ -9975,7 +9979,7 @@ screen_ins_lines(
     {
 	for (i = 0; i < line_count; ++i)
 	{
-	    windgoto(off + i, 0);
+	    windgoto(off + i, cursor_col);
 	    out_str(T_CE);
 	    screen_start();	    /* don't know where cursor is now */
 	}
@@ -10011,6 +10015,7 @@ screen_del_lines(
     int		i;
     unsigned	temp;
     int		cursor_row;
+    int		cursor_col = 0;
     int		cursor_end;
     int		result_empty;	/* result is empty until end of region */
     int		can_delete;	/* deleting line codes can be used */
@@ -10110,6 +10115,9 @@ screen_del_lines(
 						&& gui.cursor_row < end + off);
 #endif
 
+    if (wp != NULL && wp->w_wincol != 0 && *T_CSV != NUL && *T_CCS == NUL)
+	cursor_col = wp->w_wincol;
+
     if (*T_CCS != NUL)	    /* cursor relative to region */
     {
 	cursor_row = row;
@@ -10172,13 +10180,13 @@ screen_del_lines(
 	redraw_block(row, end, wp);
     else if (type == USE_T_CD)	/* delete the lines */
     {
-	windgoto(cursor_row, 0);
+	windgoto(cursor_row, cursor_col);
 	out_str(T_CD);
 	screen_start();			/* don't know where cursor is now */
     }
     else if (type == USE_T_CDL)
     {
-	windgoto(cursor_row, 0);
+	windgoto(cursor_row, cursor_col);
 	term_delete_lines(line_count);
 	screen_start();			/* don't know where cursor is now */
     }
@@ -10189,7 +10197,7 @@ screen_del_lines(
      */
     else if (type == USE_NL)
     {
-	windgoto(cursor_end - 1, 0);
+	windgoto(cursor_end - 1, cursor_col);
 	for (i = line_count; --i >= 0; )
 	    out_char('\n');		/* cursor will remain on same line */
     }
@@ -10199,12 +10207,12 @@ screen_del_lines(
 	{
 	    if (type == USE_T_DL)
 	    {
-		windgoto(cursor_row, 0);
+		windgoto(cursor_row, cursor_col);
 		out_str(T_DL);		/* delete a line */
 	    }
 	    else /* type == USE_T_CE */
 	    {
-		windgoto(cursor_row + i, 0);
+		windgoto(cursor_row + i, cursor_col);
 		out_str(T_CE);		/* erase a line */
 	    }
 	    screen_start();		/* don't know where cursor is now */
@@ -10219,7 +10227,7 @@ screen_del_lines(
     {
 	for (i = line_count; i > 0; --i)
 	{
-	    windgoto(cursor_end - i, 0);
+	    windgoto(cursor_end - i, cursor_col);
 	    out_str(T_CE);		/* erase a line */
 	    screen_start();		/* don't know where cursor is now */
 	}

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    58,
 /**/
     57,
 /**/