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kde-extraapps/gwenview/devdoc/ENVIRONMENT_VARIABLES.md

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This document describe environment variables you can set to debug Gwenview

GV_MAX_UNREFERENCED_IMAGES

How many unreferenced images (images which are not currently displayed and have not been modified) should be kept in memory.

Defaults to 3

GV_THUMBNAIL_DIR

Defines the dir where thumbnails should be generated.

Defaults to $HOME/.thumbnails/

GV_REMOTE_TESTS_BASE_URL

Used by documenttest. Define a base url where documenttest will put images to test loading from remote urls.

If not set, remote url tests are skipped.

Should be set to something like sftp://localhost/tmp

GV_FATAL_FAILS

If set, when a GV_RETURN*_IF_FAIL method fails, then kFatal() will be called, which makes it possible to stop at the place of the failure with the debugger and also makes it possible for users to report backtraces if they experiment those failures.