Improve accessibility if no or multiple certificates match

Set useful tooltips (e.g. for screen readers) for the line edit in case
no certificates or multiple certificates match the user input.

GnuPG-bug-id: 5535

src/crypto/gui/certificatelineedit.cpp

@@ -202,6 +202,7 @@ void CertificateLineEdit::updateKey()
     if (mailText.isEmpty()) {
         mLineAction->setIcon(QIcon::fromTheme(QStringLiteral("resource-group-new")));
         mLineAction->setToolTip(i18n("Open selection dialog."));
+        setToolTip({});
     } else {
         mFilterModel->setFilterFixedString(mailText);
         if (mFilterModel->rowCount() > 1) {
@@ -229,10 +230,12 @@ void CertificateLineEdit::updateKey()
             if (newKey.isNull() && newGroup.isNull()) {
                 if (mEditFinished) {
                     mLineAction->setIcon(QIcon::fromTheme(QStringLiteral("question")));
-                    mLineAction->setToolTip(i18n("Multiple certificates"));
+                    mLineAction->setToolTip(i18n("Multiple matching certificates found"));
+                    setToolTip(i18n("Multiple matching certificates found"));
                 } else {
                     mLineAction->setIcon(QIcon::fromTheme(QStringLiteral("resource-group-new")));
                     mLineAction->setToolTip(i18n("Open selection dialog."));
+                    setToolTip({});
                 }
             }
         } else if (mFilterModel->rowCount() == 1) {
@@ -242,11 +245,13 @@ void CertificateLineEdit::updateKey()
             Q_ASSERT(!newKey.isNull() || !newGroup.isNull());
             if (newKey.isNull() && newGroup.isNull()) {
                 mLineAction->setIcon(QIcon::fromTheme(QStringLiteral("emblem-error")));
-                mLineAction->setToolTip(i18n("No matching certificates found.<br/>Click here to import a certificate."));
+                mLineAction->setToolTip(i18n("No matching certificates found.<br/>Click to import a certificate."));
+                setToolTip(i18n("No matching certificates found"));
             }
         } else {
             mLineAction->setIcon(QIcon::fromTheme(QStringLiteral("emblem-error")));
-            mLineAction->setToolTip(i18n("No matching certificates found.<br/>Click here to import a certificate."));
+            mLineAction->setToolTip(i18n("No matching certificates found.<br/>Click to import a certificate."));
+            setToolTip(i18n("No matching certificates found"));
         }
     }
     mKey = newKey;
@@ -263,8 +268,6 @@ void CertificateLineEdit::updateKey()
         mLineAction->setToolTip(Formatting::validity(mGroup) +
                                 QLatin1String("<br/>") + i18n("Click for details."));
         setToolTip(Formatting::toolTip(mGroup, Formatting::ToolTipOption::AllOptions));
-    } else {
-        setToolTip(QString());
     }
 
     Q_EMIT keyChanged();