• src/conio/bitmap_con.c cterm.c

    From Deuc┬┐@VERT to Git commit to main/sbbs/master on Thu Feb 8 23:07:40 2024
    https://gitlab.synchro.net/main/sbbs/-/commit/3dfa12a6cacf3f1289f8c66c
    Modified Files:
    src/conio/bitmap_con.c cterm.c
    Log Message:
    Fix crash found by vttest.

    If DL was passed a parameter equal to or greater than the number of
    lines from the current line to the last line in the region, it would
    try to move a negative-sized box up, which resulted in a crash.

    This fixes that three ways:
    1) Do not allow moving boxes with negative X/Y sizes
    2) In dellines, clamp the lines to the number that could be deleted
    3) Don't move lines up of all rest of the lines are being deleted

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