This is the draft changelog for release 4.2-412 and the scheduled backports.

Try to merge before the release (not yet in changelog)

• Constify argv parameter in _spawnvp Constify argv parameter in _spawnvp #1279
• vim & emacs : implement MerlinUse/merlin-use/-package in editor modes vim & emacs : implement MerlinUse/merlin-use/-package in editor modes #1272
• system command variant: do not open a window console when launching a ppx system command variant: do not open a window console when launching a… #1270
• Use infinity instead of maxint. Loop holes like in emacs. Use infinity instead of maxint. Loop holes like in emacs. #1303
• Do not fail when destructing no-nodes or recovered nodes Do not fail when destructing no-nodes or recovered nodes #1304
• Modernisation of elisp code and conformance with coding guidelines Modernisation of elisp code and conformance with coding guidelines #1247
• Mppx: don't restore cookies after invocation Mppx: don't restore cookies after invocation #1309
• Update Emacs usage docs where applicable Update Emacs usage docs where applicable #1310
• fix same file documentation bug fix same file documentation bug #1265
• Add more doc-related tests Add more doc-related tests #1315

Backport to 3.4

• Use relative paths to communicate with dune ocaml-merlin Use relative paths to communicate with dune ocaml-merlin #1271
• Fix workdir detection Fix workdir detection #1284
• Constify argv parameter in _spawnvp Constify argv parameter in _spawnvp #1279
• vim & emacs : implement MerlinUse/merlin-use/-package in editor modes vim & emacs : implement MerlinUse/merlin-use/-package in editor modes #1272
• system command variant: do not open a window console when launching a ppx system command variant: do not open a window console when launching a… #1270
• Do not fail when destructing no-nodes or recovered nodes Do not fail when destructing no-nodes or recovered nodes #1304
• Modernisation of elisp code and conformance with coding guidelines Modernisation of elisp code and conformance with coding guidelines #1247
• Emacs: Fixes Emacs error loading: wrong number of arguments #1234 Fixes #1234 #1250 (already in 411)
• Emacs: Use opam var instead of opam config var Use opam var instead of opam config var #1249 (already in 411)
• Mppx: don't restore cookies after invocation Mppx: don't restore cookies after invocation #1309
• Update Emacs usage docs where applicable Update Emacs usage docs where applicable #1310
• fix same file documentation bug fix same file documentation bug #1265
• Add more doc-related tests Add more doc-related tests #1315

Backport to 411

• All that is backported to 3.4
• Completion: use type information Completion: use type information #1276 (and Fix test breakage Fix test breakage #1285)
• Improve prefixing of Destruct by filtering opened modules Improve prefixing of Destruct by removing opened modules #1277
• Remove left-over destruct file Remove left-over destruct file #1282
• [Construct] Part 0 - add AST holes, fix typing of holes and add a new holes command [Construct] Part 0 - add AST holes, fix typing of holes and add a new holes command #1242
• Holes with types Holes with types #1289
• [deconstruct][vim] Add next/previous hole commands [deconstruct][vim] Add next/previous hole commands #1287
• New holes command for Emacs + Destruct jump [deconstruct][emacs] New holes command to Emacs + Destruct jump #1291
• Use infinity instead of maxint. Loop holes like in emacs. Use infinity instead of maxint. Loop holes like in emacs. #1303