concentrate Isabelle specific physical rendering markup selection in isabelle_markup.scala;

simplified Markup_Tree.select: Stream instead of Iterator (again), explicit Option instead of default; tuned Snapshot.convert/revert;

Document_View: more precise painting of gutter icons, only if line selection area is sufficiently large;

basic support for warning/error gutter icons;

Document_View: some markup for main inner syntax categories;

Command.State.accumulate: check actual source range;

Isar_Document.reported_positions: slightly more robust treatment of positions outside the command range, notably parsing beyond EOF;

highlight bad range of nested error (here from inner parsing);

Isar_Document.reported_positions: exclude proof state output;

Document_View: less aggressive background coloring, departing from classic PG highlighting; tuned colors;

report token range after inner parse error -- often provides important clues about misunderstanding concerning lexical phase; tuned color;

slightly more robust Plugin.stop -- components might refer to Isabelle.system even after shutdown;

turned show_hyps and show_tags into proper configuration option;

discontinued obsolete ProofContext.prems_limit; simplified command setup for 'pr' etc.;

ML_Context.thm and ML_Context.thms no longer pervasive;

more explicit indication of Config.raw options, which are only needed for bootstrapping Pure;

merged

When comparing Floats use integers instead of reals (represented as rationals), generates less code when Floats are used.

isatest: back to polyml-5.3.0 due to unresolved stability issues of polyml-5.4.0 and HOL/Decision_Procs/Approximation_Ex.thy;

more antiquotations;

ML_Context.thm;

more explicit HOL-Proofs sessions, including former ex/Hilbert_Classical.thy which works in parallel mode without the antiquotation option "margin" (which is still critical);

modernized session ROOT setup;

some results of concurrency code inspection;

merged;

mention ~/.isabelle/etc/settings file

make remote ATP invocation work for those people who need to go through a proxy; thanks go to Mathieu G. for that fix

enabled do notation for option type

removed duplicate lemma

added Option.bind

merged

printing combinator for hierarchical programs

merged

add lemma cont2cont_Let_simple

add lemma cont2cont_split_simple

add List_Cpo.thy to HOLCF/Library

dropped names from serializer interface

added more explicit warning

ML_Context.ml_store_thm(s): operate on thread context instead of Unsynchronized.ref;

use setmp_noncritical for PGIP, which is presumably sequential (PG clone);

use setmp_noncritical for sequential Pure bootstrap;

turned show_brackets into proper configuration option; Sign.certify/type_check: dropped Syntax.pp_show_brackets, which is hard to hold up due to Pretty.pp and not even present in the regular end-user type check;

Syntax.standard_parse_term: eliminated redundant Pretty.pp;

structure Syntax: define "interfaces" before actual implementations;

turned show_sorts/show_types into proper configuration options;

pretty printing: prefer regular Proof.context over Pretty.pp, which is mostly for special bootstrap purposes involving theory merge, for example;

refined treatment of multi-line subexpressions;

basic support for subexpression highlighting (see also gatchan.jedit.hyperlinks.HyperlinkManager/HyperlinkTextAreaPainter);

updated configuration options;

recovered options for goal antiquotations from f45d332a90e3: actually pass context to Proof.pretty_goals (see also 45facd8f358e);

turned eta_contract into proper configuration option;

turned show_structs into proper configuration option;

configuration options Syntax.ambiguity_enabled (inverse of former Syntax.ambiguity_is_error), Syntax.ambiguity_level (with Isar attribute "syntax_ambiguity_level"), Syntax.ambiguity_limit;

pretty_goals: turned some global references and function arguments into configuration options (goals_limit = 10, goals_total = true, show_main_goal = false) depending on the context;

tuned comment;

merged