Missing possibility to merge all threads.

[jukzi]

"Merge selected threads" is disabled while "Show all threads" is enabled

When i want to merge all threads i do not want to click on every single thread. "Show all threads" should only toggle all threads to on/off while "Merge selected threads" should be unrelated to the "Show all threads"checkbox

[jukzi]

workaround:

1. show all threads.
2. Deselect a single thread
3. Merge selected threads.
4. Add the deselected thread again. => all merged