https://www.midnight-commander.org/ticket/2881
https://bugs.gentoo.org/show_bug.cgi?id=434688

commit 28cd54da5a73e6d722bd0534e3f43baedb398cea
Author: Andrew Borodin <aborodin@vmail.ru>
Date:   Tue Sep 11 10:14:48 2012 +0400

    Ticket #2881: (edit_move_forward3): fix two-columns extra offset of cursor
    
    ...after tab character.
    
    Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

diff --git a/src/editor/edit.c b/src/editor/edit.c
index bfda1b9..3dfd22e 100644
--- a/src/editor/edit.c
+++ b/src/editor/edit.c
@@ -3073,16 +3073,15 @@ edit_move_forward3 (WEdit * edit, off_t current, long cols, off_t upto)
         c = convert_to_display_c (c);
 #endif
 
+        if (c == '\n')
+            return (upto != 0 ? (off_t) col : p);
         if (c == '\t')
             col += TAB_SIZE - col % TAB_SIZE;
-        else if (c == '\n')
-            return (upto != 0 ? (off_t) col : p);
-
-        if ((c < 32 || c == 127) && (orig_c == c
+        else if ((c < 32 || c == 127) && (orig_c == c
 #ifdef HAVE_CHARSET
-                                     || (!mc_global.utf8_display && !edit->utf8)
+                                          || (!mc_global.utf8_display && !edit->utf8)
 #endif
-            ))
+                 ))
             /* '\r' is shown as ^M, so we must advance 2 characters */
             /* Caret notation for control characters */
             col += 2;