Fix bug in RenderPlan::create
Fix bug in RenderPlan::create

I was counting number of entries in the vec rather than lines.

When squashing, probably squash to first commit.

fuchsia-mirror/third_party-xi-editor,fuchsia-mirror/third_party-xi-editor,google/xi-editor,fuchsia-mirror/third_party-xi-editor,fuchsia-mirror/third_party-xi-editor,google/xi-editor,google/xi-editor,google/xi-editor