Display a dialog in Pidgin if purple_core_init returned FALSE

Review Request #2007 — Created Nov. 1, 2022 and submitted — Latest diff uploaded

Information

pidgin/pidgin
default

Reviewers

This also adds an environment variable so developers (or users for some reason)
can set a custom error message for purple_core_init to return. The intent is to
allow UI developers to control the message and make sure things display as they
expect them to.

used the PURPLE3_CORE_ERROR_MESSAGE environment variable to test the dialog including one with multiple lines of a's with no breaks and everything displayed fine.

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