patch 8.2.4928: various white space and cosmetic mistakes

Problem:    Various white space and cosmetic mistakes.
Solution:   Change spaces to tabs, improve comments.
diff --git a/src/ops.c b/src/ops.c
index 5137bbb..3940e48 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -625,7 +625,7 @@
 
     if (VIsual_select && oap->is_VIsual)
 	// use register given with CTRL_R, defaults to zero
-        oap->regname = VIsual_select_reg;
+	oap->regname = VIsual_select_reg;
 
 #ifdef FEAT_CLIPBOARD
     adjust_clip_reg(&oap->regname);
@@ -1208,9 +1208,9 @@
 		curwin->w_cursor.col -= (virtcols + 1);
 		for (; virtcols >= 0; virtcols--)
 		{
-                   if ((*mb_char2len)(c) > 1)
+		    if ((*mb_char2len)(c) > 1)
 		       replace_character(c);
-                   else
+		    else
 			PBYTE(curwin->w_cursor, c);
 		   if (inc(&curwin->w_cursor) == -1)
 		       break;