PuTTY bug wrapping-edge-cases

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summary: Multiple edge-case bugs in terminal line wrapping
class: bug: This is clearly an actual problem we want fixed.
present-in: 0.78
fixed-in: ed5bf9b3b86a45b36468a6f29d535d2f74436387 15081bb0ad3ddde9c98c75b9e0675eff0cfe75aa (0.79)

Three edge-case bugs were found in the interaction between the terminal's handling of line wrapping, double-width glyphs and the backspace control character, after 0.78 was released. This record describes all three together, because they're somewhat similar and all fixed at the same time:

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Audit trail for this bug.
(last revision of this bug record was at 2023-04-24 15:12:08 +0100)