Palette: guarantee distinguishable labels, never drop distinct actions

Dedup is now strictly by QAction pointer identity (functionally lossless:
the same action object listed once). Distinct actions are never collapsed.
When two distinct actions would show the same label, enrich it through a
fallback chain until every visible row is unique: component name ->
objectName -> shortcut -> numeric suffix. Ids remain unique so activation
always hits the intended action.

docs/PLAN.md

@@ -74,11 +74,13 @@ Therefore the palette is replaced, not extended, and the replacement is built on
 - Installs to `kf6/ktexteditor`; metadata verified valid via `KPluginMetaData`.
 - Not yet wired: frecency (the model supports a bonus, but the plugin currently
   passes 0 for every action — usage tracking is deferred).
-- Duplicate handling: actions are deduplicated by pointer identity (the same
-  action reachable through several GUI clients is listed once). Distinct actions
-  that merely share a visible label (e.g. two plugins each offering "Reload")
-  are kept but disambiguated with their component name, and every entry gets a
-  unique id so activation always triggers the right action.
+- Duplicate handling: actions are deduplicated only by pointer identity (the
+  exact same action object reachable through several GUI clients is listed
+  once — functionally lossless). Distinct actions are never dropped. When two
+  distinct actions would render with the same label, the label is enriched
+  through a fallback chain until every visible row is unique: component name →
+  objectName → shortcut → numeric suffix. Each entry also gets a unique id so
+  activation always triggers the intended action.
 
 ### M4 — Radial caret menu (mouse door) — NEXT
 - Mouse-triggered radial menu positioned at the caret

src/plugin/ollieplugin.cpp

@@ -114,21 +114,63 @@ QList<OllieView::ActionEntry> OllieView::collectActions() const
         }
     }
 
-    // Two distinct actions can share a visible label (e.g. different plugins
-    // each offering "Reload"). Those are not duplicates, so keep them, but
-    // disambiguate by provenance so the user can tell them apart.
+    // Distinct actions can share a visible label (e.g. different plugins each
+    // offering "Reload"). These are NOT duplicates — never drop them. Instead
+    // guarantee every visible row is distinguishable by enriching colliding
+    // labels through a fallback chain of discriminators, and give each entry a
+    // unique id so activation always triggers the intended action.
     QHash<QString, int> labelCounts;
     for (const ActionEntry &e : entries) {
         ++labelCounts[e.label];
     }
 
-    // Assign unique, reasonably stable ids and disambiguate colliding labels.
+    // First pass: for any shared label, append the strongest discriminator
+    // available (component, else objectName, else shortcut).
+    for (ActionEntry &e : entries) {
+        if (labelCounts.value(e.label) <= 1) {
+            continue;
+        }
+        const QString objName = e.action ? e.action->objectName() : QString();
+        QString disc;
+        if (!e.component.isEmpty()) {
+            disc = e.component;
+        } else if (!objName.isEmpty()) {
+            disc = objName;
+        } else if (!e.shortcut.isEmpty()) {
+            disc = e.shortcut;
+        }
+        if (!disc.isEmpty()) {
+            e.label = e.label + QStringLiteral(" — ") + disc;
+        }
+    }
+
+    // Second pass: if any labels are STILL identical (same label and same
+    // discriminator), append objectName/shortcut, then a numeric suffix, so no
+    // two rows ever look the same.
+    QHash<QString, int> stillColliding;
+    for (const ActionEntry &e : entries) {
+        ++stillColliding[e.label];
+    }
+    QHash<QString, int> dupSeq;
+    for (ActionEntry &e : entries) {
+        if (stillColliding.value(e.label) <= 1) {
+            continue;
+        }
+        const QString objName = e.action ? e.action->objectName() : QString();
+        if (!objName.isEmpty() && !e.label.contains(objName)) {
+            e.label += QStringLiteral(" [") + objName + QLatin1Char(']');
+        } else if (!e.shortcut.isEmpty() && !e.label.contains(e.shortcut)) {
+            e.label += QStringLiteral(" (") + e.shortcut + QLatin1Char(')');
+        } else {
+            // Last resort: number the indistinguishable rows 1..n.
+            const int n = ++dupSeq[e.label];
+            e.label += QStringLiteral(" (") + QString::number(n) + QLatin1Char(')');
+        }
+    }
+
+    // Assign unique, reasonably stable ids (independent of the display label).
     QHash<QString, int> idSeq;
     for (ActionEntry &e : entries) {
-        if (labelCounts.value(e.label) > 1 && !e.component.isEmpty()) {
-            e.label = e.label + QStringLiteral(" — ") + e.component;
-        }
-
         const QString objName = e.action ? e.action->objectName() : QString();
         QString base = e.component;
         if (!base.isEmpty()) {