qlog immediately closes when opened while a pull process is running

[André Bachmann]

Using Bazaar 2.4.2-1 with qbzr trunk on Win7 x64.

I opened Bazaar Explorer and was just trying to pull the newest changes of another svn project. While the qpull window was still active (because the pull process took a while), I clicked 'log' to view the changes.
The qlog window immediately closes right after displaying. A look in my .bzr.log shows me why:

...
LockContention: Could not acquire lock "C:/spielwiese/1.2-stable/.bzr/checkout/dirstate": (32, 'CreateFileW', 'Der Prozess kann nicht auf die Datei zugreifen, da sie von einem anderen Prozess verwendet wird.')
...

This made me wonder:
1) Why is qlog trying to lock something if it is only displaying data in the first place?
2) A little warning window to give the user a feedback about a problem would be much nicer than closing the window without any comment.

[Alexander Belchenko (bialix)]

Couple of answers on your questions:

1) qlog uses bzr API to get the history and bzr itself tries to lock everything on read operations.

2) Yes, a little dialog box should be better then crashing with error.

I think qlog needs --ui-mode option too to be able to show errors in appropriate GUI dialog when qlog invoked from explorer.

[Alexander Belchenko (bialix)]

Added bzr-explorer to the bug report, because if we will implement --ui-mode for qlog then explorer should be updated as well.