fix(dia.ToolsView): keep a tool hidden right after addTools() hidden in async mode

[kumilingus]

Description

Calling hide() on a tool right after addTools() has no effect when the tools view update is deferred — an async: true paper, or a frozen paper:

paper.on('element:pointerdown', (elementView) => {
    elementView.addTools(toolsView);
    toolsView.tools[1].hide(); // shown again on the next frame in async mode
});

Cause: the first ToolsView.update() after configure() called blurTool(), which calls show() on every tool that is not explicitly visible. That call was added in #1410 to make tools visible again when a tools view is re-added after being removed mid-focusTool() (e.g. an arrowhead drag interrupted by removeTools() on link:mouseleave, so blurTool() is never called). In sync mode the first update runs inside addTools(), before the user's hide(); in async mode it runs afterwards and undoes it.

Fix: move the reset to where it belongs — ToolView.configure() now resets the explicit visibility synchronously, inside addTools(), and the blurTool() call is dropped from the first update (the update loop already renders every visible tool).

Fixes #1445

Tests

New tests in test/jointjs/dia/linkTools.js (Visibility):

• Manually hidden toolView shown after calling addTools in async mode #1445 — hide() right after addTools() stays hidden: async paper, and frozen paper. Both failed before the fix (display: inline).
• linkTools.Arrowhead: prevent other linkTools from being displayed after mouseleave #1410 — tools hidden by focusTool() are visible again after removeTools() + addTools(): sync and deferred update. Both passed before the fix and still pass — the old scenario stays covered.

karma:joint: 2117 passed.

Note: a tool whose drag is interrupted keeps its focusOpacity (set by focus(), cleared only by blur()). That is pre-existing and not addressed here.

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved review issues remain, and all approval assessments are positive.

Review effort: Lite
Findings: None

What changed in this PR

Fixes deferred rendering so tools hidden immediately after addTools() remain hidden.

Changes:

• Reset tool visibility synchronously during configuration.
• Remove the deferred visibility reset.
• Add regression tests for sync, async, frozen, and re-add scenarios.
• Document the patch release.

File	Description
packages/​joint-core/​test/​jointjs/​dia/​linkTools.js	Adds visibility regression coverage.
packages/​joint-core/​src/​dia/​ToolView.mjs	Resets explicit visibility during configuration.
packages/​joint-core/​src/​dia/​ToolsView.mjs	Removes deferred visibility reset.
.changeset/​quiet-tools-hide.md	Documents the patch release.

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