PuTTY bug scrollback-corruption

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summary: Text corruption in scrollback
class: bug: This is clearly an actual problem we want fixed.
difficulty: fun: Just needs tuits, and not many of them.
priority: high: This should be fixed in the next release.
absent-in: 0.73
present-in: 5891142aee5cab4aedd4a6be32e80fba806f3326 34a0460f0561aa2376659775d5e1c3307a14ccde 0.74
fixed-in: 9ea0dfd8c0615a634c410520b3b1096a3908dfef (0.75)

In PuTTY 0.74, once terminal output had been pushed off the screen into the scrollback buffer, it could become subtly corrupted.

Because the scrollback data is compressed (see compressed-scrollback), this could manifest in a variety of ways. (See the commit comment for an example.)

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Audit trail for this bug.
(last revision of this bug record was at 2020-11-28 18:02:42 +0000)