* Cancel button now works (was alias for OK)

  * OK button now performs validation, only continues where possible.

  * Buttons no longer grab focus (except cancel which doesn't matter) thereby disabling interactive search

  * Added help button

  * Won't get multiple exceptions from the dialog, no longer need to kill gramps or respond to many exception dialogs to recover.

  * CTRL+F (or just start typing) interactive search now works in the form selection dialog.  It filters out mismatches.  Matches are case insensitive and match anywhere in the string.

  * Added Reset filter (doubles as an expand tree button)

  * Added compact/compress tree button. Called it Pack as I don't know how to not have buttons homogeneous (set_homogeneous,false doesn't work).

  * The form title wasn't being used. It now optionally is (it is if it begins with '/').
    e.g. title='/path1/subpath1.1/subpath1.1.1/census 1990'

  * when the form title isn't used then the dialog puts legacy entries into the same tree roots as in the past but may organise them by country or state below that.
    A Denmark census would be in the path 'Census/Denmark'.
    It also continues to use the source's name/title as the description (that is the title is ignored as previously).

    Filtering by "Denmark" is an easy way to get to them. In the US you can filter by state, or year of the census.

    EXAMPLE TITLES
    ~~~~~~~~~~~~~~
    title="/Death/World Wide/Find a Grave (https:{s}{s}www.findagrave.com{s})"
    title="/Birth/Australia/Queensland (registry)"

  * The size & position of the select dialog is now remembered in "form.ini".

  * New "hover expand" checkbox (state saved in "form.ini"), off by default.

Whole branch expanded when clicked.

Left mouse button expands node only, other buttons expand all children as well.