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"Fit" is a bit non-descriptive so a tooltip is added: "Fit image into the viewing area". Its text is changed from "Zoom to fit" to "Zoom to Fit" (capital "F") to conform with the HIG. An expanded tooltip is also added so users who might not understand why smaller images aren't enlarged are aware of the setting "Enlarge smaller images". A hyperlink is added to the help text that will open the relevant settings page. "Show Thumbnails" also gets an expanded tooltip mostly to make users aware of the cool functionalities and settings it has. Some other useful information is also added to the help texts.
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