Implementation that ports the legacy 1.9.20 "edit-mode filter panel" (tlTestCaseFilterControl, edit_mode context) into the modern Test Specification screen.

• lib/testcases/listTestCases.php instantiates tlTestCaseFilterControl($db,'edit_mode') (lib/functions/tlTestCaseFilterControl.class.php), which reads config.inc.php → $tlCfg->testcase_cfg->tree_filter_cfg->edit_mode (show_filters = ENABLED + one enable flag per filter).
• The filter panel (Smarty gui/templates/dashio/include/inc_filter_panel.tpl) re-renders getTestSpecTree() via treeMenu.inc.php → testproject::getTestSpec(), applying:
  • filter_tc_id — internal node id / external-id prefix match
  • filter_testcase_name — name substring
  • filter_toplevel_testsuite — keep only one top-level suite
  • filter_keywords + filter_keywords_filter_type — Or / And / NotLinked
  • filter_platforms — any-of match on latest version
  • filter_active_inactive — 1 = active only, 2 = inactive only
  • filter_importance, filter_execution_type, filter_workflow_status
  • filter_custom_fields — design-time custom field values
  • setting_refresh_tree_on_action — refresh tree after operations

gui/templates/testcases/testSpec.html only had the client-side quick search (#treeFilter); the REST BFF tree action (api/testcases/index.php → action=tree) ignored all filter_* parameters, so not a single legacy filter could be applied.

New helper functions (after getProjectSuites()):

• treeFilterCsvInts($v) — int-list from CSV query param
• treeFiltersFromInput($in, $p) — parse filter_* input against per-filter config enable flags
• treeEffectiveFilters($tprojectId, $fromRequest, $reset) — merge request filters with the session-persisted set ($_SESSION['testSpecFilters_<tpid>'])
• treeProjectTestcaseIds($db, $tprojectId) — ids of test cases belonging to the project (via sub-nodes of the project node)
• treeMatchTestcases(...) — returns null when no filter is active, else an associative array tcId => true of matching test cases. All attribute filters operate on the LATEST tcversion (latest_tcase_version_id view).
• treeToplevelSuiteKeep(...) — the single top-level suite to keep when filter_toplevel_testsuite is set

action=context now returns:

• filterOptions.enabled (edit_mode show_filters), statusDomain, per-filter enable flags, keyword map, platform map (design-enabled), top-level suites (option 0 = "any"), design custom fields
• persistedFilters from the session

action=tree now:

• accepts all legacy filter_* parameters plus filter_custom_fields (JSON object {"<fieldId>":"<value>"}) and reset_filters=1
• masks the browsing node by the intersection of all active filters, prunes empty suites, and when filter_toplevel_testsuite is set keeps only that top-level suite including its full nested sub-suite subtree
• is gated by the same edit_mode->show_filters config that hides the panel: filter application/session persistence are skipped when the feature is disabled (legacy parity; no filter state changes via plain GETs when the panel is hidden). Per-filter filter_* config flags hide the matching panel rows in the UI
• persists the applied filter set in the session so a page reload keeps the filtered tree
• returns filtered, filters and matchCount alongside the tree

• Integrated a filter panel into the .tree-pane (wider, 400px) with fields: Test Case ID, Title, Test Suite (top-level), Keywords (multi-select + Or/And/Not radio), Platforms (multi-select), Active/Inactive, Importance, Execution type, Workflow status, Custom fields (collapsible via "Show/Hide custom fields"), progress buttons Apply / Reset Filters, and the "Update tree after every operation" checkbox (persisted in localStorage).
• The panel appears when the Filters button is toggled and clears as soon as the user starts interacting with the tree — the same "used as an action" semantics as the legacy screen.
• New toolbar buttons: Expand tree / Collapse tree.
• Added expandAllTree, collapseAllTree, refreshSettingOn helpers and reworked loadTree() to forward the collected filter parameters.

26 new keys under the tspec. prefix in all 10 locale bundles (de en es fr it ja pt ro ru zh):

tspec.filters, tspec.filtersApplied, tspec.filterActiveInactive, tspec.filterAll, tspec.filterAny, tspec.filterExecType, tspec.filterImportance, tspec.filterKeywords, tspec.filterPlatforms, tspec.filterSuite, tspec.filterTcId, tspec.filterTitle, tspec.filterWorkflow, tspec.activeOnly, tspec.inactiveOnly, tspec.apply, tspec.resetFilters, tspec.hideCustomFields, tspec.showCustomFields, tspec.expandTree, tspec.collapseTree, tspec.refreshOnAction, tspec.keywordAnd, tspec.keywordNot, tspec.keywordOr, tspec.filterActiveInactive

All bundles validated with python3 -m json.tool.

Fixture project FT909 (tmp/fixtures_909.php) provides 6 test cases across 2 top-level suites (one with a nested sub-suite) covering importance 1/2/3, manual + automated, all workflow statuses, active + inactive, keywords Smoke and Regression, platforms Linux and Windows and a design custom field "Tier".

Verified (API, curl): every filter returns exactly the expected test cases, including the combined keyword mode semantics — e.g. Smoke+Regression And matches only the case carrying both keywords, Not matches the complement. Verified (browser): apply/reset, question-mark free tree counts (2 suites · 2 cases), "filters applied" badge, session persistence across reload, expand/collapse tree, hide/show custom fields. No new Error/Warning entries in the Event Viewer. No JS/PHP syntax errors.