Is it OK to ignore Underfull \hbox errors? I attempted, but it did not wok. I use textpos and ragged2e

Question

I tried to solve by middle of the following questions:

ragged2e: "newcommands" option produces "underfull \hbox" warnings,
Underfull \hbox (badness 10000) in paragraph in figure caption
and Underfull \hbox (badness 10000) in longtable, but it was unsuccessful.

I use the class memoir, the packages polyglossia, textpos and ragged2e. I added \linebreak. I compile in XeLaTeX. I use Linux and macOS.

I am not sure if it is OK to igonre the errors of Underful \hbox because they are very common, but someone counselled me to keep my document clean and free of errors, economic and optimised.

Here is the small code:

\documentclass[12pt, a4paper, oneside, oldfontcommands, dvipsnames]{memoir}

\usepackage{polyglossia}
\usepackage{fontspec}
\usepackage[absolute, overlay]{textpos}
\usepackage{ragged2e}

\definecolor{solitudeblue3}{HTML}{E5E9F0}

\newfontfamily\alegreya{Alegreya}[Path = ./fontes/,
  FontFace = {xb}{n}  {* Black},
  FontFace = {xb}{it} {* Black Italic},
  UprightFont       = * Regular,
  ItalicFont        = * Regular Italic,
  BoldFont          = * Bold,
  BoldItalicFont    = * Bold Italic,
  NFSSFamily        = alegreyaot
]

\newcommand{\ProfCurso}[1]
{
    \alegreya{\fontsize{15pt}{18pt}\selectfont \color{solitudeblue3} #1}
}

\begin{document}

  \begin{textblock*}{15cm}(4cm, 15cm) 
    \RaggedLeft 
    \ProfCurso{Profª Lígia Brezolin} 
    \linebreak
    \ProfCurso{Administração do Sistema de Informação II}
  \end{textblock*}

  \maketitle

\end{document}

Update

\maketitle is also accused of Underfull hbox due to ragged2e.

General answer: Never ignore errors and try your best to fix the errors as well as to avoid warnings. — , Nov 30 '18 at 15:57
Over[under]ful \hbox is a common warning. Ignoring them doesn't cause much harm. However it will be much better if you can avoid it :) — , Nov 30 '18 at 16:00
@egreg said that you should use the titlepage environment. — , Nov 30 '18 at 17:58

score 1 · Accepted Answer · answered Nov 30 '18 at 18:12

You want to use the titlingpage environment:

\documentclass[12pt, a4paper, oneside]{memoir}

\usepackage{polyglossia}
\usepackage{fontspec}
\usepackage{xcolor}

\definecolor{solitudeblue3}{HTML}{E5E9FF}

\newfontfamily\alegreya{Alegreya}[
  %Path = ./fontes/,
  FontFace = {xb}{n}  {*-Black},
  FontFace = {xb}{it} {*-BlackItalic},
  UprightFont       = *-Regular,
  ItalicFont        = *-Italic,
  BoldFont          = *-Bold,
  BoldItalicFont    = *-BoldItalic,
  NFSSFamily        = alegreyaot
]

\begin{document}

\begin{titlingpage}

\vspace*{\stretch{3}}

\fontsize{15pt}{24pt}\alegreya

\raggedleft
%\color{solitudeblue3}
Profª Lígia Brezolin \\
Administração do Sistema de Informação II

\vspace*{\stretch{2}}

\end{titlingpage}

\end{document}

I commented out the \color instruction as that color is unreadable on white background.

I was going to update, but I have tested with your codes, it worked and overfull has disappeared. I also have just discovered that \pagestyle{fancyheads} was caused by overfull, causing error to this textpos. because I have changed the layout measures to make page wider. I will correct. — Oo'-, Nov 30 '18 at 18:35

Is it OK to ignore Underfull \hbox errors? I attempted, but it did not wok. I use textpos and ragged2e

Update

1 Answers1