qt: Add Alt+PrtSc special case for one evdev key

src/qt/evdev_keyboard.cpp

@@ -69,6 +69,7 @@ static std::unordered_map<uint32_t, uint16_t> evdev_keycodes = {
     /* Multimedia keys. Guideline is to try and follow the Microsoft standard, then
        fill in remaining scancodes with OEM-specific keys for redundancy sake. Keys
        marked with # are not translated into evdev codes by the standard atkbd driver. */
+    {634, 0x54},  /* SELECTIVE_SCREENSHOT# => Alt+SysRq */
     {117, 0x59},  /* KPEQUAL */
     {418, 0x6a},  /* ZOOMIN# => Logitech */
     {420, 0x6b},  /* ZOOMRESET# => Logitech */
@@ -107,7 +108,6 @@ static std::unordered_map<uint32_t, uint16_t> evdev_keycodes = {
     {115, 0x130}, /* VOL+ */
     {150, 0x132}, /* WWW# */
     {172, 0x132}, /* HOMEPAGE */
-    {634, 0x137}, /* SELECTIVE_SCREENSHOT# => SysRq */
     {138, 0x13b}, /* HELP# */
     {213, 0x13c}, /* SOUND# => My Music/Office Home */
     {360, 0x13c}, /* VENDOR# => My Music/Office Home */

src/qt/qt_mainwindow.cpp

@@ -931,6 +931,16 @@ MainWindow::processKeyboardInput(bool down, uint32_t keycode)
 
     /* Apply special cases. */
     switch (keycode) {
+        case 0x54: /* Alt + Print Screen (special case, i.e. evdev SELECTIVE_SCREENSHOT) */
+            /* Send Alt as well. */
+            if (down) {
+                keyboard_input(down, 0x38);
+            } else {
+                keyboard_input(down, keycode);
+                keycode = 0x38;
+            }
+            break;
+
         case 0x11d: /* Right Ctrl */
             if (rctrl_is_lalt)
                 keycode = 0x38; /* map to Left Alt */