Two problems with a custom variable newly added to a title-block template:
1. Find/Replace > Folio > Custom showed an empty table, so the user had to
know and type each variable name. It now lists every custom variable the
folios already carry plus those their templates use, with empty values.
An empty value now means "leave unchanged", like every field of the main
tab; only the variables actually filled in are written to the folios.
2. The title block showed the variable's own name ("%doc-type") until the
folio's properties were opened, because interpreteVariables() only
replaces names present in the context. Placeholders in the template text
that no key resolves now render blank, as auto-added unset ones already
did since #973. Only the template's own text is considered, so a value
that contains "%something" is never touched.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
When a title block template uses custom variables (e.g. %{department},
%{owner}), the user previously had to declare each one by hand in the
folio properties 'Custom' tab before a value could be entered. Now the
template's undefined custom variables are added automatically, so the
user only fills in the values.
- listOfVariables() now extracts %{name} placeholders with a regex
(deduplicated) instead of a crude '%' strip that returned '{name}'.
- The folio properties widget merges the template's custom variables into
the Custom tab both on open (setProperties) and when the template is
changed, preserving any values already entered and skipping the
standard fields (title, author, date, ...) which have their own inputs.
Fixes#271 (variable auto-population; the revision-history request in the
thread is a separate feature).
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