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* Also use PKEXEC_UID to get username Privilege elevation can occur through pkexec, where many environment variables are not accessible. This fixes the following problem - if howdy-gtk is run without sudo, authorization occurs via pkexec, and the user variable is empty. So when adding the first model, it is unclear to which user to add it. * Update the container when the slide changes In some GTK themes, when we change a slide, we see a blank window because there is nothing to trigger the size update, and the slide is displayed at zero size. Let's force a size update so that it always works. * Remove reading of non-existent '_variables' file * More correct preview when stretching the window The "Video" tab layout did not display correctly when resizing the window. * Don't add a model if the user list is empty The list of users may be empty, and if you try to add a model, a string concatenation error with None will occur. For simplicity and consistency with the "Delete" button, we simply check the size of the list after clicking. * Show real camera ID in the 'Video' tab * Handle the case if there are no cameras via except Otherwise, when trying to read the /dev/v4l/by-path directory, an exception is thrown and the program visually freezes.
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