plugin api: restore scoreStateChanged

[Ash-86]

Resolves: #20290

PluginAPI::scoreStateChanged(() already existed but nothing called endCmd() with real data, so the signal never fired. This wires it up to the actual notation notifications so MU3-style plugins using onScoreStateChanged work again in MU4.

I haven't been able to find where (or whether) the plugin window is torn down when it's closed via the window's X button. As a result, closing a plugin's dialog this way does not currently stop these signals from firing — the subscriptions stay live until quit() is called explicitly or the app closes. If a maintainer can point me to the relevant teardown code (if it exists), I can extend this fix to disconnect there too.

for testing:

import QtQuick 
import MuseScore
import Muse.UiComponents 

MuseScore{

    id: root
    title: "TEST  "        
    version: "1.1"
    pluginType: "dialog"
    thumbnailName: "test.jpg"
    requiresScore: true	
 
    MessageDialog {
        id: errorDialog
        title: "Caution"
        text: ""        
        onAccepted: errorDialog.close()	         
    }

    FlatButton {            
            accentButton: true
            text: "quit"
            onClicked: quit()			        
    }

    onScoreStateChanged: (state) => {
        if (state.selectionChanged) {
            var el = curScore ? curScore.selection.elements[0] : null
	    console.log(el ?  ("Selected: " + el.name) : "no selection")
            errorDialog.text = el ? ("Selected: " + el.name) : "no note selected"
            errorDialog.open()
        }
    }
}

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📝 Walkthrough

Walkthrough

PluginAPI now inherits asynchronous connection support and disconnects those connections during shutdown. Setup initializes score-state notifications for selection, undo/redo, parts, and excerpts changes. Each notification emits scoreStateChanged with the relevant state map.

Priority: ➖ Normal

Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to b5aca

The score-state notification changes are ready to merge.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the regression, implementation, impact, and testing approach. However, it omits the required checklist from the repository template.	Add the complete required checklist and mark each item accurately. Include the CLA, title, commit, coding, testing, prior attempts, unnecessary changes, and test coverage items.
Docstring Coverage	⚠️ Warning	Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: restoring the Plugin API scoreStateChanged signal.
Linked Issues check	✅ Passed	The changes address issue #20290 by connecting scoreStateChanged to notation notifications, including selection changes through state.selectionChanged.
Out of Scope Changes check	✅ Passed	The changes remain within scope. The added subscriptions support score-state notifications required by issue #20290, and the lifecycle note concerns related signal cleanup.

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Actionable comments posted: 2

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Inline comments:
In `@src/engraving/api/v1/qmlpluginapi.cpp`:
- Line 245: Update the plugin window close lifecycle near
initScoreStateNotifications() so closing via the window X invokes
async_disconnectAll() or routes through PluginAPI::quit(). Ensure score-state
callbacks are disconnected for every close path, not only explicit quit() calls.
- Around line 670-722: Update PluginAPI::initScoreStateNotifications() and its
setup lifecycle to subscribe to IGlobalContext::currentNotationChanged(),
re-running the binding logic whenever the current notation changes, including
when it becomes available after startup. Store and safely replace the previous
notation-, score-, parts-, and excerpts-specific subscriptions so callbacks from
obsolete notations or scores are disconnected.

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