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Every preset binding is built as `<prefix> <key>`, and nothing checked the prefix. `"prefix": ""` in a hand-edited config therefore produced no sequence at all — it bound bare `c`, `x`, `z`, `n`, `o` and the digits directly onto NewTab, CloseActiveTab, ToggleMaximizePane and the rest, so typing an `x` in the terminal closed the tab. `"c"` and `"shift-c"` are the same trap one step removed: the letter starts a sequence and swallows the next keystroke, and shift-c is simply how a capital C is typed. `preset_prefix` now requires one chord carrying a non-shift modifier and falls back to the default otherwise, naming the refused prefix in the log. That also catches `"C-a"` — tmux's own spelling, which gpui does not parse — which previously slipped through to `action_bindings` and dismantled the preset one binding at a time, warning about each key rather than about the prefix that caused it. The GUI only ever offered Ctrl-B and Ctrl-A, so this is reachable through config.json, which the docs describe. Those docs also promised a **Prefix** field to type into; it is a two-option row, and now says so.