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Fix panic in surround_replace/delete nested multi-cursor (#9815)
Test Document ------------- ``` {{ } } ``` Steps To Reproduce ------------------ 1. 2j # move_visual_line_down 1. C # copy_selection_on_next_line 1. mdm # surround_delete Debug ----- `assertion failed: last <= from', transaction.rs:597:13` Release ------- `called `Result::unwrap()` on an `Err` value: Char range out of bounds: char range 18446744073709551614..18446744073709551615, Rope/RopeSlice char length 7', ropey-1.6.1/src/rope.rs:546:37` Description ----------- Processing the surrounding pairs in order violates the assertion the ranges are ordered. To handle nested surrounds all positions have to be sorted. Also surround_replace has to track the proper replacement character for each position.pull/9835/head
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