do not allow to query for new devices when a device is opened

CCBUG: 438229

do not allow to query for new devices when a device is opened
CCBUG: 438229
6aa69092 · Alexander Stippich · ce992725 · 6aa69092
Commit 6aa69092 authored Jun 20, 2021 by Alexander Stippich
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Showing with 6 additions and 1 deletion

src/ksanewidget.cpp src/ksanewidget.cpp +6 -1

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--- a/src/ksanewidget.cpp
+++ b/src/ksanewidget.cpp
@@ -337,7 +337,12 @@ QString KSaneWidget::selectDevice(QWidget *parent)

 void KSaneWidget::initGetDeviceList() const
 {
-    d->m_findDevThread->start();
+    /* On some SANE backends, the handle becomes invalid when
+     * querying for new devices. Hence, this is only allowed when
+     * no device is currently opened. */
+    if (d->m_saneHandle == nullptr) {
+        d->m_findDevThread->start();
+    }
 }

 bool KSaneWidget::openDevice(const QString &deviceName)