vim-patch:7.4.186

Problem:    Insert in Visual mode sometimes gives incorrect results.
            (Dominique Pelle)
Solution:   Remember the original insert start position. (Christian Brabandt,
            Dominique Pelle)

https://code.google.com/p/vim/source/detail?r=4d12112c5efae071aecbeed1a7196f18950457b3

src/edit.c

@@ -284,6 +284,7 @@ static char_u *do_insert_char_pre(int c);
 
 static colnr_T Insstart_textlen;        /* length of line when insert started */
 static colnr_T Insstart_blank_vcol;     /* vcol for first inserted blank */
+static bool update_Insstart_orig = true; /* set Insstart_orig to Insstart */
 
 static char_u   *last_insert = NULL;    /* the text of the previous insert,
                                            K_SPECIAL and CSI are escaped */
@@ -353,6 +354,9 @@ edit (
    * error message */
   check_for_delay(TRUE);
 
+  // set Insstart_orig to Insstart
+  update_Insstart_orig = true;
+
 #ifdef HAVE_SANDBOX
   /* Don't allow inserting in the sandbox. */
   if (sandbox != 0) {
@@ -582,6 +586,10 @@ edit (
     if (arrow_used)         /* don't repeat insert when arrow key used */
       count = 0;
 
+    if (update_Insstart_orig) {
+      Insstart_orig = Insstart;
+    }
+
     if (stop_insert_mode) {
       /* ":stopinsert" used or 'insertmode' reset */
       count = 0;
@@ -5860,6 +5868,7 @@ stop_insert (
    * now in a different buffer. */
   if (end_insert_pos != NULL) {
     curbuf->b_op_start = Insstart;
+    curbuf->b_op_start_orig = Insstart_orig;
     curbuf->b_op_end = *end_insert_pos;
   }
 }
@@ -6944,6 +6953,7 @@ static void ins_ctrl_g(void)
 
     /* Need to reset Insstart, esp. because a BS that joins
      * a line to the previous one must save for undo. */
+    update_Insstart_orig = false;
     Insstart = curwin->w_cursor;
     break;