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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https://gitlab.synchro.net/main/sbbs/-/commit/d07815a94f78fa5a3bfc9f02
Modified Files:
src/conio/bitmap_con.c cterm.c
Log Message:
Implement double-height.

This is so gross... outputting any character depends on every
character above it, so it must be checked every time. If the state
was ste up differently, this could be avoided, but it's not, so it
can't.

For v2, I'm going to want to store some per-line data in a separate
struct so I can track this.

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