Add expand/search button to room pane when narrow

src/gui/Pages/Chat/RoomPane/MemberView/MemberView.qml

@@ -65,11 +65,12 @@ HColumnLayout {
         color: theme.chat.roomPane.bottomBar.background
 
         Layout.fillWidth: true
-        Layout.minimumHeight: theme.baseElementsHeight
-        Layout.maximumHeight: Layout.minimumHeight
+        Layout.preferredHeight: childrenRect.height
 
         HRowLayout {
-            anchors.fill: parent
+            width: parent.width
+            layoutDirection:
+                expandButton.visible ? Qt.RightToLeft : Qt.LeftToRight
 
             HTextField {
                 id: filterField
@@ -82,7 +83,6 @@ HColumnLayout {
                 opacity: width >= 16 * theme.uiScale ? 1 : 0
 
                 Layout.fillWidth: true
-                Layout.fillHeight: true
 
                 // FIXME: fails to display sometimes for some reason if
                 // declared normally
@@ -124,6 +124,7 @@ HColumnLayout {
                 Behavior on opacity { HNumberAnimation {} }
             }
 
+            HColumnLayout {
                 HButton {
                     id: inviteButton
                     icon.name: "room-send-invite"
@@ -149,7 +150,7 @@ HColumnLayout {
                         },
                     )
 
-                Layout.fillHeight: true
+                    Layout.preferredHeight: filterField.implicitHeight
 
                     HShortcut {
                         sequences: window.settings.keys.inviteToRoom
@@ -157,6 +158,25 @@ HColumnLayout {
                             if (inviteButton.enabled) inviteButton.clicked()
                     }
                 }
+
+                HButton {
+                    id: expandButton
+                    icon.name: "room-pane-expand-search"
+                    backgroundColor: inviteButton.backgroundColor
+                    toolTip.text: qsTr("Expand search")
+                    visible: Layout.preferredHeight > 0
+
+                    // Will trigger roomPane.requireDefaultSize
+                    onClicked: filterField.forceActiveFocus()
+
+                    Layout.preferredHeight:
+                        filterField.width < 32 * theme.uiScale ?
+                        filterField.implicitHeight :
+                        0
+
+                    Behavior on Layout.preferredHeight { HNumberAnimation {} }
+                }
+            }
         }
     }
 }

src/icons/thin/room-pane-expand-search.svg

@@ -0,0 +1,3 @@
+<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="m23.809 21.646-6.205-6.205c1.167-1.605 1.857-3.579 1.857-5.711 0-5.365-4.365-9.73-9.731-9.73-5.365 0-9.73 4.365-9.73 9.73 0 5.366 4.365 9.73 9.73 9.73 2.034 0 3.923-.627 5.487-1.698l6.238 6.238zm-20.955-11.916c0-3.792 3.085-6.877 6.877-6.877s6.877 3.085 6.877 6.877-3.085 6.877-6.877 6.877c-3.793 0-6.877-3.085-6.877-6.877z"/>
+</svg>