span rules shows white area when used with background color

[parivalavanm]

Please refer to the original tex.stackexchange question I had asked. This looks similar to the another question about rules not being rendered properly on acrobat #468

Adding the same here

\documentclass{article}
\usepackage[table]{xcolor}
\usepackage{tabularray}

\definecolor{jobcolor}{RGB} {0,   146, 207}

\begin{document}

\begin{tblr}{
    colspec={|c| c| c| c| c| c |c|},
    rowspec={Q[jobcolor] Q[jobcolor]},
}

\hline
% first header row
\SetCell[r=2]{c} 2 Rows
& \SetCell[c=2]{c} 2 Columns
&
& \SetCell[c=2]{c}\cellcolor{blue!25} next 2 Columns
& & \SetCell[r=2,c=2]{c} 2 Rows\linebreak 2 Columns \\
\SetHline[1]{2-3}{fg=red,wd=0.5pt, leftpos=-0.5, rightpos=-0.5, endpos}
\SetHline[1]{4-5}{fg=red,wd=0.5pt, leftpos=-0.5, rightpos=-0.5, endpos}

% second header row
& 2-2 & 2-3 & 2-4 & 2-5 & &  \\
\hline

% first data row
3-1 & 3-2 & 3-3 & 3-4 & 3-5 & 3-6 & 3-7 \\
\hline
\end{tblr}
\end{document}

The output looks like given below:

The span rule is created using \SetHline[1]{2-3}{fg=red,wd=0.5pt, leftpos=-0.5, rightpos=-0.5, endpos}. If you look closely, there is a white rule that appears where the trimming is happening with leftpos and rightpos. I am not sure from where the white color/rule is coming from.

Is this a challenge with the package or am i doing something wrong?

To make it clear, if i remove the colspec from the tblr block and remove the leftpos=-0.5, rightpos=-0.5, from the SetHline, then the output will look like the following:

The rule below the spanned cells extend through the entire cell. i need them to not include the area of the column separator. This makes it look as if the columns 2,3 and 4,5 are merged together

[lvjr]

At present you cannot set bg colors for border lines. As a workaround you can add bg colors with tikz library (added in v2005A):

\documentclass{article}
\usepackage{tabularray}
\UseTblrLibrary{tikz}
\definecolor{jobcolor}{RGB}{0,146,207}
\begin{document}

\begin{tblrtikzbelow}
  \draw[jobcolor,line width=1pt] (h2-|v2) -- (h2-|v6);
\end{tblrtikzbelow}%
\begin{tblr}{
    colspec={|c| c| c| c| c| c |c|},
    rowspec={Q[jobcolor] Q[jobcolor]},
}
\hline
% first header row
\SetCell[r=2]{c} 2 Rows
& \SetCell[c=2]{c} 2 Columns
&
& \SetCell[c=2]{c} next 2 Columns
& & \SetCell[r=2,c=2]{c} 2 Rows\linebreak 2 Columns \\
\SetHline[1]{2-3}{fg=red,wd=0.5pt, leftpos=-0.5, rightpos=-0.5, endpos}
\SetHline[1]{4-5}{fg=red,wd=0.5pt, leftpos=-0.5, rightpos=-0.5, endpos}
% second header row
& 2-2 & 2-3 & 2-4 & 2-5 & &  \\
\hline
% first data row
3-1 & 3-2 & 3-3 & 3-4 & 3-5 & 3-6 & 3-7 \\
\hline
\end{tblr}

\end{document}

[peaR-red]

In the next update we plan to incorporate a new key bgcolor that does exactly this. Additionally, fg will now be an alias of fgcolor and similarly for bg. This has already been implemented in an unreleased version.

You may test it early by pasting the following in your preamble.

% Uncomment these lines if you wish to paste them
% in the preamble
% \makeatletter
% \ExplSyntaxOn
\tl_new:N \l__tblr_hline_bg_tl
\tl_new:N \l__tblr_vline_bg_tl
\tl_new:N \l__tblr_bg_tl
\dim_new:N \l__tblr_tmpa_dim

\__tblr_keys_define:nn { hline/inner }
  {
    bgcolor .tl_set:N = \l__tblr_hline_bg_tl,
    bg .meta:n = { bgcolor = {#1} },
    fgcolor .tl_set:N = \l__tblr_hline_fg_tl,
    fg .meta:n = { fgcolor = {#1} },
  }
\__tblr_keys_define:nn { vline/inner }
  {
    bgcolor .tl_set:N = \l__tblr_vline_bg_tl,
    bg .meta:n = { bgcolor = {#1} },
    fgcolor .tl_set:N = \l__tblr_vline_fg_tl,
    fg .meta:n = { fgcolor = {#1} },
  }

\cs_set_protected_nopar:Npn \__tblr_set_hline_cmd:n #1
  {
    \__tblr_child_parse:ne {#1} { \int_use:N \c@colcount }
    \__tblr_child_map_inline:n
      {
        \__tblr_set_hline_option:nnn { ##1 } { @dash }
          { \exp_not:V \l__tblr_hline_dash_tl }
        \tl_if_empty:NF \l__tblr_hline_wd_tl
          {
            \__tblr_set_hline_option:nnn { ##1 } { wd } { \l__tblr_hline_wd_tl }
          }
        \tl_if_empty:NF \l__tblr_hline_fg_tl
          {
            \__tblr_set_hline_option:nnn { ##1 } { fg } { \l__tblr_hline_fg_tl }
          }
        \tl_if_empty:NF \l__tblr_hline_bg_tl
          {
            \__tblr_set_hline_option:nnn { ##1 } { bg } { \l__tblr_hline_bg_tl }
          }
      }
    \tl_if_empty:NF \l__tblr_hline_leftpos_tl
      {
        \bool_if:NTF \l__tblr_hline_endpos_bool
          {
            \__tblr_child_get_first:N \l_tmpa_tl
            \__tblr_set_hline_option:nnn
              { \l_tmpa_tl } { leftpos } { \l__tblr_hline_leftpos_tl }
          }
          {
            \__tblr_child_map_inline:n
              {
                \__tblr_set_hline_option:nnn
                  { ##1 } { leftpos } { \l__tblr_hline_leftpos_tl }
              }
          }
      }
    \tl_if_empty:NF \l__tblr_hline_rightpos_tl
      {
        \bool_if:NTF \l__tblr_hline_endpos_bool
          {
            \__tblr_child_get_last:N \l_tmpb_tl
            \__tblr_set_hline_option:nnn
              { \l_tmpb_tl } { rightpos } { \l__tblr_hline_rightpos_tl }
          }
          {
            \__tblr_child_map_inline:n
              {
                \__tblr_set_hline_option:nnn
                  { ##1 } { rightpos } { \l__tblr_hline_rightpos_tl }
              }
          }
      }
  }

\cs_set_protected_nopar:Npn \__tblr_set_vline_cmd:n #1
  {
    \__tblr_child_parse:ne {#1} { \int_use:N \c@rowcount }
    \__tblr_child_map_inline:n
      {
        \__tblr_spec_gput:nee { vline }
          { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / @dash }
          { \exp_not:V \l__tblr_vline_dash_tl }
        \tl_if_empty:NF \l__tblr_vline_wd_tl
          {
            \__tblr_spec_gput:nee { vline }
              { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / wd }
              { \l__tblr_vline_wd_tl }
          }
        \tl_if_empty:NF \l__tblr_vline_fg_tl
          {
            \__tblr_spec_gput:nee { vline }
              { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / fg }
              { \l__tblr_vline_fg_tl }
          }
        \tl_if_empty:NF \l__tblr_vline_bg_tl
          {
            \__tblr_spec_gput:nee { vline }
              { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / bg }
              { \l__tblr_vline_bg_tl }
          }
        \tl_if_empty:NF \l__tblr_vline_abovepos_tl
          {
            \__tblr_spec_gput:nee { vline }
              { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / abovepos }
              { \l__tblr_vline_abovepos_tl }
          }
        \tl_if_empty:NF \l__tblr_vline_belowpos_tl
          {
            \__tblr_spec_gput:nee { vline }
              { [##1][\int_use:N \c@colnum](\l__tblr_vline_num_tl) / belowpos }
              { \l__tblr_vline_belowpos_tl }
          }
      }
  }

\cs_set_protected:Npn \__tblr_build_hline_segment_real:nn #1 #2
  {
    \tl_set:Ne \l__tblr_s_tl
      { \__tblr_prop_item:ne { inner } { rulesep } }
    \vbox_set:Nn \l__tblr_c_box
      {
        \tex_hbox:D to \l__tblr_col_o_wd_dim {}
        \int_step_inline:nn { \l__tblr_n_tl }
          {
            \tl_set:Ne \l__tblr_h_tl
              { \__tblr_spec_item:ne { hline } { [#1](##1) / @hline-height } }
            \tl_set:Ne \l__tblr_bg_tl
              { \__tblr_spec_item:ne { hline } { [#1][#2](##1) / bg } }
            \hrule height 0pt
            \dim_set:Nn \l_tmpa_dim
              { \__tblr_spec_item:ne { vline } { [#2] / @vline-width } }
            \dim_set:Nn \l_tmpb_dim
              { \__tblr_spec_item:ne { vline } { [\int_eval:n { #2 + 1 }] / @vline-width } }
            \dim_set:Nn \l__tblr_tmpa_dim
              { \l__tblr_col_o_wd_dim - \l_tmpa_dim - \l_tmpb_dim }
            \hbox_set_to_wd:Nnn \l__tblr_b_box { \l__tblr_col_o_wd_dim }
              {
                \tl_if_empty:NF \l__tblr_bg_tl
                  {
                    \skip_horizontal:n { \l_tmpa_dim }
                    \color { \l__tblr_bg_tl }
                    \vrule width \l__tblr_tmpa_dim height \l__tblr_h_tl depth 0pt
                    \skip_horizontal:n { -\l_tmpa_dim - \l__tblr_tmpa_dim }
                  }
                \__tblr_get_hline_left_right_skips:nnn {#1} {#2} {##1}
                \skip_horizontal:N \l__tblr_hline_leftskip_dim
                \tl_set:Ne \l__tblr_f_tl
                  { \__tblr_spec_item:ne { hline } { [#1][#2](##1) / fg } }
                \tl_if_empty:NTF \l__tblr_f_tl
                  {
                    \tl_if_empty:NF \lTblrDefaultHruleColorTl
                      { \color { \lTblrDefaultHruleColorTl } }
                  }
                  { \color { \l__tblr_f_tl } }
                \__tblr_get_hline_segment_child:nnn {#1} {#2} {##1}
                \skip_horizontal:N \l__tblr_hline_rightskip_dim
              }
            \box_set_ht:Nn \l__tblr_b_box { \l__tblr_h_tl }
            \box_set_dp:Nn \l__tblr_b_box { 0pt }
            \box_use:N \l__tblr_b_box
            \skip_vertical:n { \l__tblr_s_tl }
          }
        \skip_vertical:n { - \l__tblr_s_tl }
      }
    \box_use:N \l__tblr_c_box
    \skip_horizontal:n { - \l__tblr_col_b_wd_dim }
  }

\cs_set_protected:Npn \__tblr_build_vline_segment_real:nn #1 #2
  {
    \tl_set:Ne \l__tblr_s_tl
      { \__tblr_prop_item:ne { inner } { rulesep } }
    \hbox_set:Nn \l__tblr_a_box
      {
        \int_step_inline:nn { \l__tblr_n_tl }
          {
            \tl_set:Ne \l__tblr_w_tl
              { \__tblr_spec_item:ne { vline } { [#2](##1) / @vline-width } }
            \tl_set:Ne \l__tblr_bg_tl
              { \__tblr_spec_item:ne { vline } { [#1][#2](##1) / bg } }
            \dim_set:Nn \l_tmpa_dim
              { \dim_eval:n { \l__tblr_row_ht_dim + \l__tblr_row_dp_dim } }
            \vbox_set_to_ht:Nnn \l__tblr_b_box { \l_tmpa_dim }
              {
                \tl_if_empty:NF \l__tblr_bg_tl
                  {
                    \color { \l__tblr_bg_tl }
                    \hrule width \l__tblr_w_tl height \l_tmpa_dim depth 0pt
                    \skip_vertical:n { -\l_tmpa_dim }
                  }
                \tl_set:Ne \l__tblr_f_tl
                  { \__tblr_spec_item:ne { vline } { [#1][#2](##1) / fg } }
                \tl_if_empty:NTF \l__tblr_f_tl
                  {
                    \tl_if_empty:NF \lTblrDefaultVruleColorTl
                      { \color { \lTblrDefaultVruleColorTl } }
                  }
                  { \color { \l__tblr_f_tl } }
                \__tblr_get_vline_above_below_skips:nnn {#1} {#2} {##1}
                \skip_vertical:N \l__tblr_vline_aboveskip_dim
                \__tblr_get_vline_segment_child:nnnee {#1} {#2} {##1}
                  { \dim_eval:n { \l__tblr_row_ht_dim } }
                  { \dim_eval:n { \l__tblr_row_dp_dim } }
                \skip_vertical:N \l__tblr_vline_belowskip_dim
              }
            \box_set_wd:Nn \l__tblr_b_box { \l__tblr_w_tl }
            \box_use:N \l__tblr_b_box
            \skip_horizontal:n { \l__tblr_s_tl }
          }
        \skip_horizontal:n { - \l__tblr_s_tl }
      }
    \vbox_set:Nn \l__tblr_c_box { \box_use:N \l__tblr_a_box }
    \box_set_ht:Nn \l__tblr_c_box { \dim_use:N \l__tblr_row_ht_dim }
    \box_set_dp:Nn \l__tblr_c_box { \dim_use:N \l__tblr_row_dp_dim }
    \box_use:N \l__tblr_c_box
  }
% \ExplSyntaxOff
% \makeatother

Note: it is a design choice that background rules will ignore rule trimming with abovepos, belowpos, etc.