visibility: fix a comment introduced before which is not up-to-date 265cd9e19d26 introduced a comment in _filterederror that was not updated with the latest iterations of the patch, fix the comment. Differential Revision: https://phab.mercurial-scm.org/D1851

rust: avoid redundant 'static lifetime 'static is apparently automatic for const variables. Differential Revision: https://phab.mercurial-scm.org/D1846

pull: hold wlock for the full operation when --update is used With now, the wlock is not held between the pull and the update. This can lead to race condition and make logic checking to post pull results more complicated (eg: with _afterlock).

hgweb: drop support of browsers that don't understand <canvas> (BC) Internet Explorer 8 and below need excanvas aka ExplorerCanvas to support canvas tag at all. We used to vendor the library in Mercurial, but IE8 was discontinued and all support for it ceased in January 2016. We should do the same and remove excanvas library. Apart from just cleaning up code, this will also make downstream Debian packages stop depending on libjs-excanvas, for example.

rust: add TODO about lifetime of program_name variable Per review comment in D1581. Differential Revision: https://phab.mercurial-scm.org/D1847

rust: move import of PathBuf By moving it to the single function that uses it, we eliminate a #cfg. Differential Revision: https://phab.mercurial-scm.org/D1845