fix: move to mid of tab

now the cursor is moved to the end of tab

main.cpp

@@ -97,11 +97,11 @@ int main(int argc, char *argv[])
 			++it;
 			wrap.clear();
 			ofx = 0; // invalidated
-			if (y == (maxy - 1) && ry < curnum)
+			if (y == maxy - 1 && ry < curnum)
 				scrolldown();
 			else {
-				wmove(text_win, y + 1, x);
-				ofx = calc_offset_dis(x, 0, *it);
+				ofx = calc_offset_dis(x, *it);
+				wmove(text_win, y + 1, x = rx);
 			}
 			break;
 
@@ -112,9 +112,9 @@ int main(int argc, char *argv[])
 			} if (y == 0 && ofy != 0)
 				scrollup();
 			else if (y != 0) {
-				wmove(text_win, y - 1, x);
-				--it; 
-				ofx = calc_offset_dis(x, 0, *it);
+				--it;
+				ofx = calc_offset_dis(x, *it);
+				wmove(text_win, y - 1, x = rx);
 			}
 			wrap.clear();
 			break;

utils/sizes.c

@@ -42,13 +42,15 @@ inline void get_off(unsigned &x, unsigned &i, const gap_buf &buf)
 	i++;
 }
 
-// offset until displayed x from from bytes in buf
-long calc_offset_dis(unsigned dx, unsigned from, const gap_buf &buf)
+// returns offset until displayed x from from bytes in buf (bytes - dx)
+// global rx becomes the dx where counting stopped at 
+long calc_offset_dis(unsigned dx, const gap_buf &buf)
 {
-	unsigned x = 0, i = from;
+	unsigned x = 0, i = 0;
 	while (x < dx && i < buf.len)
 		get_off(x, i, buf);
-	return (long)i - (long)from - (long)x;
+	rx = x;
+	return (long)i - (long)x;
 }
 
 // displayed characters dx to bytes