From 982f608eb1dd3ad86c5dfec300ba878de32b357c Mon Sep 17 00:00:00 2001
From: Mike Lowis <mike.lowis@gentex.com>
Date: Wed, 5 Oct 2016 09:00:08 -0400
Subject: [PATCH] fixed tab handling for locating cursor coordinates

---
 screen.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/screen.c b/screen.c
index c7843b9..9035ac6 100644
--- a/screen.c
+++ b/screen.c
@@ -134,6 +134,7 @@ static void sync_view(Buf* buf, unsigned csr) {
 }
 
 void screen_update(Buf* buf, unsigned csr, unsigned* csrx, unsigned* csry) {
+    /* scroll the view and reflow the screen lines */
     sync_view(buf, csr);
     if (buf->insert_mode)
         screen_reflow(buf);
@@ -142,8 +143,15 @@ void screen_update(Buf* buf, unsigned csr, unsigned* csrx, unsigned* csry) {
         unsigned start = Rows[y]->off;
         unsigned end   = Rows[y]->off + Rows[y]->rlen - 1;
         if (start <= csr && csr <= end) {
-            *csry = y;
-            *csrx = csr - start;
+            unsigned pos = start;
+            for (unsigned x = 0; x < NumCols;) {
+                if (pos == csr) {
+                    *csry = y, *csrx = x;
+                    break;
+                }
+                if (buf_get(buf,pos++) == '\t')
+                    x += (TabWidth - (x % TabWidth));
+            }
             break;
         }
     }
-- 
2.49.0