Add safeguards to secure input on macOS (#11928)

* Add safeguards to secure input on macOS

* Fixes #11906
* Disable secure input when password widget is hidden as well as focused out
* Add safeguard to ensure the internal counter that macOS keeps is always set to 1 preventing the ability to disable secure input by focus/unfocus a password field

Author: droidmonkey

src/gui/PasswordWidget.cpp

@@ -231,7 +231,7 @@ bool PasswordWidget::eventFilter(QObject* watched, QEvent* event)
         if (isVisible() && (type == QEvent::KeyPress || type == QEvent::KeyRelease || type == QEvent::FocusIn)) {
             checkCapslockState();
         }
-        if (type == QEvent::FocusIn || type == QEvent::FocusOut) {
+        if (type == QEvent::FocusIn || type == QEvent::FocusOut || type == QEvent::Hide) {
             osUtils->setUserInputProtection(type == QEvent::FocusIn);
         }
     }

src/gui/osutils/macutils/MacUtils.cpp

@@ -152,11 +152,22 @@ bool MacUtils::isCapslockEnabled()
 
 void MacUtils::setUserInputProtection(bool enable)
 {
+    static bool secureInputEnabled = false;
     if (enable) {
+        /*
+         * MacOS keeps a single counter over all apps that needs to be zero to disable secure input. By never going
+         * higher than 1 internally this makes sure secure input doesn't stay active after calling this function
+         * multiple times.
+         */
+        if (secureInputEnabled) {
+            DisableSecureEventInput();
+        }
         EnableSecureEventInput();
     } else {
         DisableSecureEventInput();
     }
+    // Store our last known state
+    secureInputEnabled = enable;
 }
 
 /**