Fix copying multi-line selected rich text

For rich text (rendered HTML) fields and areas, the selectedText
property for some reason contains "\u2028" or "\u2029"
characters that look like newlines in Qt programs but are just
invisible anywhere else. Translate them to normal "\n".

src/gui/Base/HSelectableLabel.qml

@@ -9,6 +9,11 @@ TextEdit {
 
     property bool enableLinkActivation: true
 
+    // For rich text, selectedText returns some weird invisible characters
+    // instead of real newlines
+    readonly property string selectedPlainText:
+        selectedText.replace(/[\u2028\u2029]/g, "\n")
+
     function selectWordAt(position) {
         label.cursorPosition = positionAt(position.x, position.y)
         label.selectWord()

src/gui/Base/HTextArea.qml

@@ -30,6 +30,11 @@ TextArea {
 
     property string previousDefaultText: ""  // private
 
+    // For rich text, selectedText returns some weird invisible characters
+    // instead of real newlines
+    readonly property string selectedPlainText:
+        selectedText.replace(/[\u2028\u2029]/g, "\n")
+
     property bool enableCustomImagePaste: false
 
     signal customImagePaste()

src/gui/Base/HTextContextMenu.qml

@@ -50,14 +50,14 @@ HMenu {
     HMenuItem {
         icon.name: "cut-text"
         text: qsTr("Cut")
-        enabled: control.selectedText
+        enabled: control.selectedPlainText
         onTriggered: control.cut()
     }
 
     HMenuItem {
         icon.name: "copy-text"
         text: qsTr("Copy")
-        enabled: control.selectedText
+        enabled: control.selectedPlainText
         onTriggered: control.copy()
     }
 

src/gui/Base/HTextField.qml

@@ -30,6 +30,11 @@ TextField {
 
     property string previousDefaultText: ""  // private
 
+    // For rich text, selectedText returns some weird invisible characters
+    // instead of real newlines
+    readonly property string selectedPlainText:
+        selectedText.replace(/[\u2028\u2029]/g, "\n")
+
     function reset() {
         clear()
         text = Qt.binding(() => defaultText || "")

src/gui/DebugConsole.qml

@@ -208,9 +208,9 @@ HDrawer {
 
                 Layout.fillWidth: true
 
-                onSelectedTextChanged: if (selectedText) {
+                onSelectedTextChanged: if (selectedPlainText) {
                     selectedOutputDelegateIndex = model.index
-                    selectedOutputText          = selectedText
+                    selectedOutputText          = selectedPlainText
                 } else if (selectedOutputDelegateIndex === model.index) {
                     selectedOutputDelegateIndex = -1
                     selectedOutputText          = ""
@@ -249,7 +249,7 @@ HDrawer {
                         icon.name: "copy-text"
                         text: qsTr("Copy")
                         onTriggered: {
-                            if (delegate.selectedText) {
+                            if (delegate.selectedPlainText) {
                                 delegate.copy()
                                 return
                             }
@@ -337,7 +337,7 @@ HDrawer {
             Keys.onPressed: ev => {
                 if (
                     ev.matches(StandardKey.Copy) &&
-                    ! inputArea.selectedText &&
+                    ! inputArea.selectedPlainText &&
                     selectedOutputText
                 ) {
                     ev.accepted = true

src/gui/Pages/Chat/Composer/MessageArea.qml

@@ -225,7 +225,7 @@ HTextArea {
         if (ev.text && autoCompletionOpen) acceptAutoCompletion()
 
         if (ev.matches(StandardKey.Copy) &&
-            ! area.selectedText &&
+            ! area.selectedPlainText &&
             eventList &&
             (eventList.selectedCount || eventList.currentIndex !== -1))
         {
@@ -237,7 +237,7 @@ HTextArea {
         // FIXME: buggy
         // if (ev.modifiers === Qt.NoModifier &&
         //     ev.key === Qt.Key_Backspace &&
-        //     ! area.selectedText)
+        //     ! area.selectedPlainText)
         // {
         //     ev.accepted = true
         //     area.remove(

src/gui/Pages/Chat/Timeline/EventContent.qml

@@ -82,7 +82,7 @@ HRowLayout {
             window.settings.maxMessageCharactersPerLine
         )
 
-    readonly property alias selectedText: contentLabel.selectedText
+    readonly property alias selectedText: contentLabel.selectedPlainText
 
 
     spacing: theme.chat.message.horizontalSpacing
@@ -182,9 +182,9 @@ HRowLayout {
             Layout.maximumWidth: eventContent.maxMessageWidth
             Layout.fillWidth: true
 
-            onSelectedTextChanged: if (selectedText) {
+            onSelectedTextChanged: if (selectedPlainText) {
                 eventList.delegateWithSelectedText = model.id
-                eventList.selectedText             = selectedText
+                eventList.selectedText             = selectedPlainText
             } else if (eventList.delegateWithSelectedText === model.id) {
                 eventList.delegateWithSelectedText = ""
                 eventList.selectedText             = ""
@@ -274,7 +274,7 @@ HRowLayout {
                 radius: theme.chat.message.radius
                 z: -100
                 color: eventDelegate.checked &&
-                       ! contentLabel.selectedText &&
+                       ! contentLabel.selectedPlainText &&
                        ! mousePointHandler.active &&
                        ! mouseShiftPointHandler.active ?
                        theme.chat.message.checkedBackground :