Add contents line in principal TOC but not in chapter TOC

Question

I would like to add a vertical space in my principal TOC before the last chapter. I used addtocontents{toc}{protectvspace{1,5cm}} before my chapter and it does the job in the principal TOC. But it also add an undesired vertical space in the TOC of the chapter I created using  printcontents[chapter]{l}{1}{setcounter{tocdepth}{2}} . Here is an exemple :
 documentclass[twoside,openright,titlepage,numbers=noenddot,
footinclude,cleardoublepage=empty,abstract=on,
paper=a4,fontsize=12pt
]{scrreprt}

usepackage{titletoc}

titlecontents{lsection} 
[0.8 cm]
{}
{contentslabel[thecontentslabel]{1cm}}
{}
{hspace{0.15cm}smallcontentspage}
[]

usepackage{tcolorbox}

begin{document}

tableofcontents

chapter{First Chap}
startcontents[chapter]
begin{tcolorbox}[width=10.5cm, colback=gray!20!white, colframe= gray!20!white,
    title=Sommaire,coltitle=black,
    fonttitle=smallbfseriessffamily]
    printcontents[chapter]{l}{1}{setcounter{tocdepth}{2}}
end{tcolorbox}

section{Section a1}
section{Section b1}

chapter{Second Chap}
startcontents[chapter]
begin{tcolorbox}[width=10.5cm, colback=gray!20!white, colframe= gray!20!white,
    title=Sommaire,coltitle=black,
    fonttitle=smallbfseriessffamily]
    printcontents[chapter]{l}{1}{setcounter{tocdepth}{2}}
end{tcolorbox}
section{Section a2}
section{Section b2}

addtocontents{toc}{protectvspace{1,5cm}}
chapter{Third Chap}
startcontents[chapter]
begin{tcolorbox}[width=10.5cm, colback=gray!20!white, colframe= gray!20!white,
    title=Sommaire,coltitle=black,
    fonttitle=smallbfseriessffamily]
    printcontents[chapter]{l}{1}{setcounter{tocdepth}{2}}
end{tcolorbox}
section{Section a3}
section{Section b3}

end{document}

G. de Man · Answer

Firstly, I would like to say that I'm not quite sure if what you are trying to achieve is really possible in a clean way as you are basically reading information from the same TOC. I would say my solution to the problem really wouldn't be optimal, but it works.
I removed the addtocontents{toc}{protectvspace{1,5cm}} from your document and added the following code instead:
usepackage{etoolbox}
pretochapter{%
  ifnumvalue{chapter}=2addtocontents{toc}{vskip100pt}fi
}

This basically achieves the same thing as you were doing, without it interfering with any other spacing, which your code was doing for some reason. There is still a big space in the sommaire of chapter three, but this can be solved easily using the following code for chapter 3:
begin{tcolorbox}[width=10.5cm, colback=gray!20!white, colframe= gray!20!white,
    title=Sommaire,coltitle=black,
    fonttitle=smallbfseriessffamily]
    vspace{-100pt}
    printcontents[chapter]{l}{1}{setcounter{tocdepth}{2}}
end{tcolorbox}

All I did here was add a negative vertical spacing to compensate for the extra spacing introduced by the comment above.
I hope to have helped you with this solution!

Add contents line in principal TOC but not in chapter TOC

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