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(robertc) Partial fix for bug #39542 - allow lightweight checkouts over http.

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* Commit performs one less XML parse. (Robert Collins)

* ``bzr checkout --lightweight`` now operates on readonly branches as well

as readwrite branches. This fixes bug #39542 for lightweight checkouts

but not for heavyweight ones (the default). (Robert Collins)

BUG FIXES:

* Handle boundary="" lines properly to allow access through a Squid proxy.

* WorkingTree.pending_merges is deprecated. Please use the get_parent_ids

(introduced in 0.10) method instead. (Robert Collins)

* WorkingTree has a new lock_tree_write method which locks the branch for

read rather than write. This is appropriate for actions which only need

the branch data for reference rather than mutation. A new decorator

needs_tree_write_lock is provided in the workingtree module. Like the

needs_read_lock and needs_write_lock decorators this allows static

declaration of the locking requirements of a function to ensure that

a lock is taken out for casual scripts. (Robert Collins)

* All WorkingTree methods which write to the tree, but not to the branch

have been converted to use ``needs_tree_write_lock`` rather than

``needs_write_lock``. Also converted is the revert, conflicts and tree

transform modules. This provides a modest performance improvement on

metadir style trees, due to the reduce lock-acquisition, and a more

significant performance improvement on lightweight checkouts from

remote branches, where trivial operations used to pay a significant

penalty. It also provides the basis for allowing readonly checkouts.

(Robert Collins)

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