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Thunderbird spontaneously ignores threads

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Sometimes when I return to my computer after using Thunderbird, but having left Thunderbird open, a message appears at the bottom asking me if I want to undo "ignore thread" for some message or other. The problem is that I didn't intentionally tell Thunderbird to ignore a thread; I don't even use the feature, ever. However Thunderbird ignores threads anyway. I completely lost track of several important messages before figuring out that this feature (which previously I wasn't even aware of) seemed to be activating spontaneously. Am I doing something that could trigger it? This only happens if I leave Thunderbird open while I'm away from the computer. On my return, I find the message asking if I want to undo "ignore thread." I think the thread in question may be one that's highlighted because I have left the cursor resting on it. But surely that shouldn't be enough to make Thunderbird ignore the thread. Or is it? It's been happening a lot lately.

Sometimes when I return to my computer after using Thunderbird, but having left Thunderbird open, a message appears at the bottom asking me if I want to undo "ignore thread" for some message or other. The problem is that I didn't intentionally tell Thunderbird to ignore a thread; I don't even use the feature, ever. However Thunderbird ignores threads anyway. I completely lost track of several important messages before figuring out that this feature (which previously I wasn't even aware of) seemed to be activating spontaneously. Am I doing something that could trigger it? This only happens if I leave Thunderbird open while I'm away from the computer. On my return, I find the message asking if I want to undo "ignore thread." I think the thread in question may be one that's highlighted because I have left the cursor resting on it. But surely that shouldn't be enough to make Thunderbird ignore the thread. Or is it? It's been happening a lot lately.

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The shortcut to Ignore Thread is the K key. Is it possible you're activating it by accident?

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That's possible. I usually just randomly (I thought) hit a key to wake up my computer, and the "k" key is right in a spot I'm likely to hit. I'll be careful about what key I use and see if that makes a difference. Thanks!