Merge #19210: qt: Get rid of cursor in out-of-focus labels

bd315eb5e27d49d47759ae9417328427426cb269 qt: Get rid of cursor in out-of-focus labels (Hennadii Stepanov)

Pull request description:

  After clicking on `QLabel` with selectable text the cursor remains forever:

  ![47532924-65e7b200-d8ba-11e8-9254-7bde658961cb](https://user-images.githubusercontent.com/32963518/84038485-ad945200-a9a8-11ea-89e3-c7c17d02a611.png)

  This PR fixes this visual bug.

  Earlier attempts to fix this issue:
  - #14577
  - #14810 (combined with other UX feature)

ACKs for top commit:
  promag:
    Code review ACK bd315eb5e27d49d47759ae9417328427426cb269.
  laanwj:
    Tested ACK bd315eb5e27d49d47759ae9417328427426cb269

Tree-SHA512: 6bf89362412e5ce9a4dec6944b62fe44fc31ca49cda7f6e2eb37e847fac9dccb68bca7ac6877b19e42add2333e40d0b4265757ead105ac0a5d28f8ab43b322c3

1 files changed, 22 insertions, 0 deletions

diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index 3cadac2f2f..7f439fa45e 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -450,6 +450,28 @@ bool ToolTipToRichTextFilter::eventFilter(QObject *obj, QEvent *evt)
     return QObject::eventFilter(obj, evt);
 }
 
+LabelOutOfFocusEventFilter::LabelOutOfFocusEventFilter(QObject* parent)
+    : QObject(parent)
+{
+}
+
+bool LabelOutOfFocusEventFilter::eventFilter(QObject* watched, QEvent* event)
+{
+    if (event->type() == QEvent::FocusOut) {
+        auto focus_out = static_cast<QFocusEvent*>(event);
+        if (focus_out->reason() != Qt::PopupFocusReason) {
+            auto label = qobject_cast<QLabel*>(watched);
+            if (label) {
+                auto flags = label->textInteractionFlags();
+                label->setTextInteractionFlags(Qt::NoTextInteraction);
+                label->setTextInteractionFlags(flags);
+            }
+        }
+    }
+
+    return QObject::eventFilter(watched, event);
+}
+
 void TableViewLastColumnResizingFixer::connectViewHeadersSignals()
 {
     connect(tableView->horizontalHeader(), &QHeaderView::sectionResized, this, &TableViewLastColumnResizingFixer::on_sectionResized);