Small qml fixes

resources/qml/CommunitiesList.qml

@@ -143,11 +143,11 @@ Page {
                     enabled: false
                     height: avatarSize
                     roomid: model.id
-                    textColor: model.avatarUrl.startsWith(":/") ? communityItem.unimportantText : communityItem.importantText
+                    textColor: model.avatarUrl?.startsWith(":/") == true ? communityItem.unimportantText : communityItem.importantText
                     url: {
-                        if (model.avatarUrl.startsWith("mxc://"))
+                        if (model.avatarUrl?.startsWith("mxc://") == true)
                             return model.avatarUrl.replace("mxc://", "image://MxcImage/");
-                        else if (model.avatarUrl.length > 0)
+                        else if ((model.avatarUrl?.length ?? 0) > 0)
                             return model.avatarUrl;
                         else
                             return "";

resources/qml/MatrixText.qml

@@ -2,9 +2,6 @@
 //
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-// TODO: using any Qt 6 API version will screw up the reply text color. We need to
-//       figure out a more permanent fix than just importing the old version.
-//import QtQuick 2.15
 import QtQuick
 import QtQuick.Controls
 import im.nheko

resources/qml/ReplyPopup.qml

@@ -29,7 +29,7 @@ Rectangle {
         anchors.rightMargin: replyPopup.width < 450 ? 2 * (22 + 16) : 3 * (22 + 16)
         anchors.top: parent.top
         anchors.topMargin: Nheko.paddingSmall
-        eventId: room.reply ?? ""
+        eventId: room?.reply ?? ""
         userColor: TimelineManager.userColor(modelData.userId, palette.window)
         visible: room && room.reply
         maxWidth: parent.width - anchors.leftMargin - anchors.rightMargin

resources/qml/dialogs/AliasEditor.qml

@@ -4,10 +4,10 @@
 
 import ".."
 import "../components"
-import QtQuick 2.12
-import QtQuick.Controls 2.5
-import QtQuick.Layouts 1.3
-import im.nheko 1.0
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+import im.nheko
 
 
 ApplicationWindow {

src/timeline/TimelineFilter.cpp

@@ -163,14 +163,20 @@ TimelineFilter::setSource(TimelineModel *s)
 
         this->setSourceModel(s);
 
-        connect(s, &TimelineModel::currentIndexChanged, this, &TimelineFilter::currentIndexChanged);
-        connect(
-          s, &TimelineModel::fetchedMore, this, &TimelineFilter::fetchAgain, Qt::QueuedConnection);
-        connect(s,
-                &TimelineModel::dataChanged,
-                this,
-                &TimelineFilter::sourceDataChanged,
-                Qt::QueuedConnection);
+        if (s) {
+            connect(
+              s, &TimelineModel::currentIndexChanged, this, &TimelineFilter::currentIndexChanged);
+            connect(s,
+                    &TimelineModel::fetchedMore,
+                    this,
+                    &TimelineFilter::fetchAgain,
+                    Qt::QueuedConnection);
+            connect(s,
+                    &TimelineModel::dataChanged,
+                    this,
+                    &TimelineFilter::sourceDataChanged,
+                    Qt::QueuedConnection);
+        }
 
         // reset the search index a second time just to be safe.
         incrementalSearchIndex = 0;