Revert "Improve performance for very long lines"

This reverts commit d5694c0f35.

Fixes #351
See #348

cmd/micro/cursor.go

@@ -331,7 +331,6 @@ func (c *Cursor) GetVisualX() int {
 	runes := []rune(c.buf.Line(c.Y))
 	tabSize := int(c.buf.Settings["tabsize"].(float64))
 	return StringWidth(string(runes[:c.X]), tabSize)
-	// return c.Loc.X
 }
 
 // Relocate makes sure that the cursor is inside the bounds of the buffer

cmd/micro/util.go

@@ -294,17 +294,3 @@ func JoinCommandArgs(args ...string) string {
 
 	return buf.String()
 }
-
-func Sub(str string, start, end int) string {
-	len := Count(str)
-	if len > start && len > end {
-		return str[start:end]
-	}
-	if len > start && len < end {
-		return str[start:]
-	}
-	if len < start {
-		return str
-	}
-	return ""
-}

cmd/micro/view.go

@@ -690,15 +690,8 @@ func (v *View) DisplayView() {
 		}
 
 		// Now we actually draw the line
-		colN := v.leftCol
-		screenX += v.leftCol
-		charNum = Loc{v.leftCol, charNum.Y}
-		for _, ch := range Sub(line, v.leftCol, v.leftCol+v.width) {
-			if screenX-v.leftCol > v.x+v.width {
-				charNum = charNum.Move(Count(line[:v.leftCol+v.width]), v.Buf)
-				break
-			}
-
+		colN := 0
+		for _, ch := range line {
 			lineStyle := defStyle
 
 			if v.Buf.Settings["syntax"].(bool) {