Issue #2055: make save dialog compatibility information understandable.
* The minimum GIMP version for this XCF is always written down when it is GIMP 2.8 or over. * The list of features warrating the minimum version is now listed in an expander container rather than as tooltip (making the list actually discoverable!). * The warning on compression is now displayed as its own text under the checkbox (only when checking the box actually changes anything compatibility-wise), and not as additional text to the minimum GIMP version label. Otherwise it had far too much weight on the minimum compatible GIMP version text and people were wondering what it meant. We should not tell people what the checkbox cannot do (it cannot improve compatibility in some cases), only what it can do (it can improve compatibility in other cases). * Update the feature list real-time when checking the compression box (making it even more obvious that tile compression may have a say in compatibility). * Metadata info is still added on the GIMP version label as it does not limit compatibility of the XCF file itself.
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