[bug #68192] [long-term] check all dynamic ("heap") memory allocations for success

Follow-up Comment #9, bug #68192 (group groff):


commit 306047e880015b746c2f8dd4d736c3530a2d6738
Author: G. Branden Robinson <[email protected]>
Date:   Sun May 31 21:06:31 2026 -0500                                   
                                                                         
    [grohtml]: Refactor. (1/2)                                           
                                                                         
    Be more fastidious with heap-allocated memory.                       
                                                                         
    * src/devices/grohtml/html-table.cpp: Use ISO C++98 exceptions to handle
      heap storage allocation failures.  Preprocessor-include C++ "<new>"
      header file and project-local "errarg.h" and "error.h" header files.
                                                                         
      (tabs::init): Slightly refactor.  Introduce new local variable     
      `newtab` (a pointer to `tab_position`, lifting 2 identical attempted 
      memory allocations out of both branches of an if/else.               
                                                                           
      (tabs::init):                                                      
      (html_table::html_table):                                          
      (html_table::insert_column):                                       
      (html_indent::html_indent): Catch `std::bad_alloc` exception and   
      `fatal()` out with an attempt to describe what we were doing.      
                                                                         
    Continues the long process of fixing Savannah #68192.




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