tuned proofs;

sneak message into "bad" markup as property -- to be displayed after YXML parsing;

apply all text edits to each node, before determining the resulting doc_edits -- allow several iterations to consolidate spans etc.;
expand Clear edit before sending to prover;
at most one full reparse of each node;

clarified undefined, unparsed, unfinished command spans;
common reparse_spans, diff_commands;
some support for consolidate_spans after change of perspective;

tuned;

discontinued mostly unused markup for command spans;

more visible markup of malformed input as "bad";

tuned proofs

some attempts to keep malformed syntax errors focussed, without too much red spilled onto the document view;

refined recover_spans: take visible range into account, reparse and trim results -- to improve editing experience wrt. unbalanced quotations etc.;
tuned signature;