accept Backtab and Shift-Tab for hovering selection backwards

resources/qml/ForwardCompleter.qml

@@ -80,15 +80,16 @@ Popup {
                 completerPopup.completer.searchString = text;
             }
             Keys.onPressed: {
-                if (event.key == Qt.Key_Up && completerPopup.opened) {
+                if ((event.key == Qt.Key_Up || event.key == Qt.Key_Backtab) && completerPopup.opened) {
                     event.accepted = true;
                     completerPopup.up();
-                } else if (event.key == Qt.Key_Down && completerPopup.opened) {
+                } else if ((event.key == Qt.Key_Down || event.key == Qt.Key_Tab) && completerPopup.opened) {
                     event.accepted = true;
-                    completerPopup.down();
-                } else if (event.key == Qt.Key_Tab && completerPopup.opened) {
-                    event.accepted = true;
-                    completerPopup.down();
+                    if (event.key == Qt.Key_Tab && (event.modifiers & Qt.ShiftModifier)) {
+                        completerPopup.up();
+                    } else {
+                        completerPopup.down();
+                    }
                 } else if (event.matches(StandardKey.InsertParagraphSeparator)) {
                     completerPopup.finishCompletion();
                     event.accepted = true;

resources/qml/MessageInput.qml

@@ -195,7 +195,11 @@ Rectangle {
                     } else if (event.key == Qt.Key_Tab) {
                         event.accepted = true;
                         if (popup.opened) {
-                            popup.up();
+                            if (event.modifiers & Qt.ShiftModifier) {
+                                popup.down();
+                            } else {
+                                popup.up();
+                            }
                         } else {
                             var pos = cursorPosition - 1;
                             while (pos > -1) {
@@ -219,7 +223,7 @@ Rectangle {
                     } else if (event.key == Qt.Key_Up && popup.opened) {
                         event.accepted = true;
                         popup.up();
-                    } else if (event.key == Qt.Key_Down && popup.opened) {
+                    } else if ((event.key == Qt.Key_Down || event.key == Qt.Key_Backtab) && popup.opened) {
                         event.accepted = true;
                         popup.down();
                     } else if (event.key == Qt.Key_Up && event.modifiers == Qt.NoModifier) {

resources/qml/QuickSwitcher.qml

@@ -39,15 +39,16 @@ Popup {
             completerPopup.completer.searchString = text;
         }
         Keys.onPressed: {
-            if (event.key == Qt.Key_Up && completerPopup.opened) {
+            if ((event.key == Qt.Key_Up || event.key == Qt.Key_Backtab) && completerPopup.opened) {
                 event.accepted = true;
                 completerPopup.up();
-            } else if (event.key == Qt.Key_Down && completerPopup.opened) {
+            } else if ((event.key == Qt.Key_Down || event.key == Qt.Key_Tab) && completerPopup.opened) {
                 event.accepted = true;
-                completerPopup.down();
-            } else if (event.key == Qt.Key_Tab && completerPopup.opened) {
-                event.accepted = true;
-                completerPopup.down();
+                if (event.key == Qt.Key_Tab && (event.modifiers & Qt.ShiftModifier)) {
+                    completerPopup.up();
+                } else {
+                    completerPopup.down();
+                }
             } else if (event.matches(StandardKey.InsertParagraphSeparator)) {
                 completerPopup.finishCompletion();
                 event.accepted = true;