In a merged view, I would like to be able to quickly hide messages from one of the merged files, and then show them again, without having to create a new merged view. For example, if I merge 4 log files, I might want to quickly hide messages from one of those files, and then show them again. If the log files included in the merge were listed in the tree on the left under the merge, and those files had check boxes which set their visibility, that would be perfect.

Here's an example of what the "Log files & Filters" might look like - here I have a merge called "My merge" using file1, file2, file3 and file4, and I have temporarily hidden the messages from file 3 by unchecking the check box next to file 3
my merge
    All Log Levels
  X file1
  X file2
    file3
  X file4