revset: add new topographical sort Sort revisions in reverse revision order but grouped by topographical branches. Visualised as a graph, instead of: o 4 | | o 3 | | | o 2 | | o | 1 |/ o 0 revisions on a 'main' branch are emitted before 'side' branches: o 4 | o 1 | | o 3 | | | o 2 |/ o 0 where what constitutes a 'main' branch is configurable, so the sort could also result in: o 3 | o 2 | | o 4 | | | o 1 |/ o 0 This sort was already available as an experimental option in the graphmod module, from which it is now removed. This sort is best used with hg log -G: $ hg log -G "sort(all(), topo)"

revset: move groupbranchiter over from graphmod This move is to prepare the adaptation of this function into a toposort predicate.

revset: record if a set is in topographical order A later revision adds actual topographical sorting. Recording if a set is in this order allows hg log -G to avoid re-sorting the revset.

chg: make timeout adjustable Before this patch, chg will give up when it cannot connect to the new server within 10 seconds. If the host has high load during that time, 10 seconds is not enough. This patch makes it adjustable using the CHGTIMEOUT environment variable.

chg: exec pager in child process Before this patch, chg uses the old pager behavior (pre 369741ef7253), which executes pager in the main process. The user will see the exit code of the pager, instead of the hg command. Like 369741ef7253, this patch fixes the behavior by executing the pager in the child process, and wait for it at the end of the main process.

tests: move chg pager test to test-pager.t The test is valid for both hg and chg. Since we are adding another chg-related pager test, let's put them together.