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When I use the command overrightarrow{...} I observe that the space between the two lines increases due to the presence of this command. I often use the command widebar{...}, bar{...} or overbar{...}. I don't like the symbol vec{...} because the arrow is inclined.

In a university textbook in English that I use are used the classic vector symbols both in bold and without bold. Obviously the space between the two lines seems to be the same and it does not increase.

Two images from my textbook:

There are two questions:

1) If I were to use for the vector symbols complete with mtpro2 could I have vectors both in bold and those without bold?

2) Is there a possibility of not increasing the space between lines when using the vectors like English textbook images?

Here there is my MWE:

documentclass[a4paper,12pt,fleqn]{book}

usepackage[utf8]{inputenc}

usepackage{mathtools,amssymb,lipsum}



begin{document}



noindent

lipsum[1]

noindent 

$overrightarrow{d}$, $overrightarrow{a}$, lipsum[2]



end{document} 

and the output:

You can also see in the red rectangle that the arrow overlaps the character.

You can use the esvect package, which defines 8 possible arrow tips that you choose through an option:

Here is the result with the default (option d):

    documentclass[a4paper, 12pt, fleqn]{book}

    usepackage[utf8]{inputenc}

    usepackage{mathtools,amssymb,lipsum}

    usepackage{esvect}



    begin{document}



    noindent

    lipsum[1]

    noindent

    $vv{d}$, $vv{a}$, lipsum[2]



    end{document} 

Here is a way:

documentclass[a4paper,12pt,fleqn]{book}

usepackage[utf8]{inputenc}

usepackage{bm}

usepackage{mathtools,amssymb,lipsum}

newsaveboxmybox

newcommandmyVec[1]{saveboxmybox{hbox{ensuremath{overrightarrow{#1}}}}ensuremath{overrightarrow{#1}}{rule{0pt}{dimexprhtmybox+3pt}}}



begin{document}

lipsum[1]

noindent$myVec{f}bm{myVec{a}}$lipsum[1]

end{document}

But I can't really understand the "possibility of not increasing the line's spacing" and also don't let the arrows overlap the previous line... because for exapmle in your textbooks the technology could be so old that they was just added after the actual text and the author had created/changed his wording in order to not leave an arrow below a character that needs space below the "baseline".

Response to @Bernard's comment:

I prefer the usepackage[b]{esvect} option but I don't think it affects the mtpro2[lite] package; for the bold arrow it doesn't work. At the contrary, it only makes me the letter in bold.

documentclass[12pt]{book} 

usepackage{newtxtext}

usepackage[utf8]{inputenc}

usepackage{mathtools,amssymb,lipsum}

usepackage[b]{esvect}

letBbbkrelax

usepackage[lite]{mtpro2}



begin{document}

noindent

lipsum[1]

noindent

$vv{d}$, $vv{a}$, $vv{d}$, ${boldmathvv{a}}$,lipsum[2]

end{document}