transplant: use "ui.extractchoices()" to show the list of available responses Before this patch, transplant extension shows the list of available responses by specific string, even though the prompt string passed to "ui.promptchoice()" has enough (maybe i18n-ed) information. This patch uses "ui.extractchoices()" to show the list of available responses.

transplant: use "ui.promptchoice()" for interactive transplant Before this patch, transplant extension uses "ui.prompt()" for interactive transplant, and has to check whether user response returned by "ui.prompt()" is valid or not in own code. In addition to it, transplant extension uses response characters (e.g. "y", "n", and so on) directly in own code, and this disallows to use another response characters by translation, even though the help shown by '?' typing is translatable. This patch uses "ui.promptchoice()" instead of "ui.prompt()" to resolve problems above.

transplant: add test for interactive transplant

record: use "ui.extractchoices()" to get the list of available responses Before this patch, record extension gets the list of available responses from online help document of "hg record" in the tricky way, even though the value passed to "ui.promptchoice()" has enough (maybe i18n-ed) information. This patch uses "ui.extractchoices()" to get the list of available responses.

ui: add "extractchoices()" to share the logic to extract choices from prompt

branchmap: use set for update code We are doing membership test and substraction. new code is marginally faster.

branchmap: simplify update code We drop iterrevs which are not needed anymore. The know head are never a descendant of the updated set. It was possible with the old strip code. This simplification make the code easier to read an update.

branchmap: stop useless rev -> node -> rev round trip We never use the node of new revisions unless in the very specific case of closed heads. So we can just use the revision number. So give another handfull of percent speedup.

branchmap: stop membership test in update logic Now that no user try to update the cache on a truncated repo we can drop the extra lookup. Give an handfull percent speedup on big branchmap update.

branchmap: remove silly line break The line fit in 80 character limit without it. It is even shorter without it.