Pass, as well as various fixes and several improvements:

The metadata viewer and editor got a big cleaning and refactoring GeoTIFF tag support added (recognized and stored into image parasites at import, then exported back when TIFF format is used) with appropriate 'Save GeoTIFF data' checkbox (checked by default) to disable GeoTIFF metadata export when not desired. Improve loading of MinIsWhite and MinIsBlack images More safety checks as a result of fuzz-testing Improve loading of multi page tiffs with linear TRC Improve support of ExtraSamples fields with non-conformant TIFF files Fixed loading 2 and 4-bit TIFF images in grayscale and indexed Also if reading of a directory fail, we now output a message to warn of possible data loss. Import attempts to count the directories by reading them when the headers does not announce any directory, which allows to salvage images with improper header. Import now ignores TIFF pages with invalid directory (rather than freezing and output an error to warn of possible data loss) Better handling of Exif.Thumbnail.* tags on export Image export would not fail, but at least we make the person aware metadata is not properly exported. JPEG export will better advertize when metadata export fails, possibly with relevant error message. Improve reading of iptc tags that appear more than once Snap to grid only works off-canvas when 'Show All' is enabled because off-canvas grid is not visible otherwise, though snap to guide and vectors will always work off-canvas. This is used for snap to guides, grid and vectors. Point snapping now works outside the canvas. Fix stack overflow when loading very large XCF files on Windows Display profile name in 'Color space' field of Image Properties and improve ellipsis & wrap on dialog fields whose contents' size is not controllable together with better dialog size management. Some timeout has also been added to not spam the core process with non-processable DBus calls during startup. DBus calls (remote file open, typically with double click on file browser and remote command run) are now processed after all command line files (in case of calls during startup) and in the call order (FIFO) for consistency.

Ignore Pentax and PentaxDng metadata at export because they are unsupported

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