Commits on Dec 24, 2023

1. MAINT: Change the positions of the calls of the visitor-function …

   Before the text-visitor-function had been called at each change of the output.
   But this can lead to wrong coordinates because the output may sent after changing the text-matrix for the next text.
   As an example have a look at resources/Sample_Td-matrix.pdf: The text_matrix is computed correctly at the Td-operations but the text had been sent after applying the next transformation.
   
   In this pull request the texts are sent inside the TJ and Tj operations.
   This may lead to sending letters instead of words:
   
   ```    x=264.53, y=403.13, text='M'
       x=264.53, y=403.13, text='etad'
       x=264.53, y=403.13, text='ata'
       x=307.85, y=403.13, text=' '
   ```
   
   Therefore there is a second commit which introduces a temporarily visitor inside the processing of TJ.
   The temp visitor ist used to collect the letters of TJ which will be sent after processing of TJ.
   When setting the temp visitor the original parameter is manipulated. I don't know if this is bad style in python.
   In case of bad style a local variable current_text_visitor may be introduced.
   
   See also issue #1377. I haven't checked if #1377 had the Td-matrix-problem or the one to be solved by this PR.
   
   --
   
   This PR is a copy of #1389
   The PR#1389 was made a long time ago (before we renamed to pypdf),
   but it seems still valuable.
   
   This PR migrated the changes to the new codebase. Full credit
   to rogmann for all of the changes.
   
   Co-authored-by: rogmann <github@rogmann.org>

   

   MartinThoma and srogmann committed Dec 24, 2023
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