patch 9.0.1782: prop_list() does not return text_padding_left

Problem:  prop_list() does not return text_padding_left
Solution: Store and return the text_padding_left value for text
          properties

closes: #12870

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/textprop.c b/src/textprop.c
index 44f7ff0..c6e1795 100644
--- a/src/textprop.c
+++ b/src/textprop.c
@@ -308,6 +308,7 @@
 			    | (lnum < end_lnum ? TP_FLAG_CONT_NEXT : 0)
 			    | ((type->pt_flags & PT_FLAG_INS_START_INCL)
 						     ? TP_FLAG_START_INCL : 0);
+	tmp_prop.tp_padleft = text_padding_left;
 	mch_memmove(newprops + i * sizeof(textprop_T), &tmp_prop,
 							   sizeof(textprop_T));
 
@@ -969,10 +970,14 @@
 {
     proptype_T *pt;
     int buflocal = TRUE;
+    int virtualtext_prop = prop->tp_id < 0;
 
-    dict_add_number(dict, "col", prop->tp_col);
-    dict_add_number(dict, "length", prop->tp_len);
-    dict_add_number(dict, "id", prop->tp_id);
+    dict_add_number(dict, "col", (prop->tp_col == MAXCOL) ? 0 : prop->tp_col);
+    if (!virtualtext_prop)
+    {
+	dict_add_number(dict, "length", prop->tp_len);
+	dict_add_number(dict, "id", prop->tp_id);
+    }
     dict_add_number(dict, "start", !(prop->tp_flags & TP_FLAG_CONT_PREV));
     dict_add_number(dict, "end", !(prop->tp_flags & TP_FLAG_CONT_NEXT));
 
@@ -990,7 +995,7 @@
 	dict_add_number(dict, "type_bufnr", buf->b_fnum);
     else
 	dict_add_number(dict, "type_bufnr", 0);
-    if (prop->tp_id < 0)
+    if (virtualtext_prop)
     {
 	// virtual text property
 	garray_T    *gap = &buf->b_textprop_text;
@@ -1014,6 +1019,8 @@
 	// text_wrap
 	if (prop->tp_flags & TP_FLAG_WRAP)
 	    dict_add_string(dict, "text_wrap", (char_u *)"wrap");
+	if (prop->tp_padleft != 0)
+	    dict_add_number(dict, "text_padding_left", prop->tp_padleft);
     }
 }