Cannot correctly identify uppercase and lowercase

Very unfriendly for users who have both English and Chinese input methods! I use the keyboard case switch for English. At this point my input method is lowercase English. But the plugin recognizes that my input method is uppercase. I have to switch the input method manually to use it properly. I think the plugin should recognize the user's input method correctly, not by whether the user's uppercase key is triggered or not. Take my example: I have two input methods: Chinese and English. When I am in Chinese input method, the input method is switched to English by triggering the uppercase key, which is lowercase, and only uppercase when combined with the Shift key. I think I've described it well

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The issue does not mention a file, test, or entry point. Start by locating Vimium's input-method and uppercase/lowercase detection, then reproduce the English and Chinese input-method transitions described; done means the plugin distinguishes the active input method from the keyboard's uppercase state.