use lineheight rather than buffer length

Gopkg.lock

@@ -189,11 +189,11 @@
 
 [[projects]]
   branch = "master"
-  digest = "1:d6df25dee1274e63c25f84c257bc504359f975dedb791eec7a5b51992146bb76"
+  digest = "1:66bb9b4a5abb704642fccba52a84a7f7feef2d9623f87b700e52a6695044723f"
   name = "github.com/jesseduffield/gocui"
   packages = ["."]
   pruneopts = "NUT"
-  revision = "4fca348422d8b6136e801b222858204a35ee369a"
+  revision = "03e26ff3f1de2c1bc2205113c3aba661312eee00"
 
 [[projects]]
   branch = "master"

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/heroku/rollrus v0.0.0-20180515183152-fc0cef2ff331
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99
 	github.com/jesseduffield/go-getter v0.0.0-20180822080847-906e15686e63
-	github.com/jesseduffield/gocui v0.0.0-20180919095827-4fca348422d8
+	github.com/jesseduffield/gocui v0.0.0-20180921065632-03e26ff3f1de
 	github.com/jesseduffield/termbox-go v0.0.0-20180919093808-1e272ff78dcb
 	github.com/jmespath/go-jmespath v0.0.0-20160202185014-0b12d6b521d8
 	github.com/kardianos/osext v0.0.0-20170510131534-ae77be60afb1

pkg/gui/view_helpers.go

@@ -183,7 +183,7 @@ func (gui *Gui) cursorDown(g *gocui.Gui, v *gocui.View) error {
 	}
 	cx, cy := v.Cursor()
 	ox, oy := v.Origin()
-	ly := len(v.BufferLines()) - 1
+	ly := v.LinesHeight() - 1
 	_, height := v.Size()
 	maxY := height - 1
 
@@ -219,7 +219,7 @@ func (gui *Gui) correctCursor(v *gocui.View) error {
 	ox, oy := v.Origin()
 	_, height := v.Size()
 	maxY := height - 1
-	ly := len(v.BufferLines()) - 1
+	ly := v.LinesHeight() - 1
 	if oy+cy <= ly {
 		return nil
 	}

vendor/github.com/jesseduffield/gocui/view.go

@@ -447,8 +447,8 @@ func (v *View) ViewBufferLines() []string {
 	return lines
 }
 
-func (v *View) ViewLinesHeight() int {
-	return len(v.viewLines)
+func (v *View) LinesHeight() int {
+	return len(v.lines)
 }
 
 // ViewBuffer returns a string with the contents of the view's buffer that is