Theme error

[emako]

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Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. System use dark mode
2. Space to show a iamge, turn to light mode, Space to close the image, Sapce to show a image again
3. Use mouse to select an other file
4. See error: window border and background will be light mode and font color is dark mode