extensionPrefs: Add info popover to headerbar

Extensions can have a major impact on stability and performance. Now that
the tool will become the main way for users to manage their extensions, it
is an appropriate place to warn the user of that risk.

Add a small info popover to the headerbar to display that warning, together
with the previously removed hint of where to go for finding new extensions.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/1968

diff --git a/js/extensionPrefs/ui/extensions-window.ui b/js/extensionPrefs/ui/extensions-window.ui
index 4ac68b9d28e5a2b949218f59b0f58d23852b1df1..a3068033c35e53403c636c502ae0fcbc9be3c9c7 100644 (file)
--- a/js/extensionPrefs/ui/extensions-window.ui
+++ b/js/extensionPrefs/ui/extensions-window.ui
@@ -2,6 +2,44 @@
 <!-- Generated with glade 3.22.0 -->
 <interface>
   <requires lib="gtk+" version="3.20"/>
+  <object class="GtkPopover" id="infoPopover">
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="orientation">vertical</property>
+        <property name="margin">12</property>
+        <property name="spacing">6</property>
+        <child>
+          <object class="GtkLabel">
+            <property name="visible">True</property>
+            <property name="label" translatable="yes">To find and add extensions, visit &lt;a href="https://extensions.gnome.org"&gt;extensions.gnome.org&lt;/a&gt;.</property>
+            <property name="use_markup">True</property>
+            <property name="xalign">0</property>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="visible">True</property>
+            <property name="label" translatable="yes">Warning</property>
+            <property name="xalign">0</property>
+            <property name="margin_top">6</property>
+            <attributes>
+              <attribute name="weight" value="bold"/>
+            </attributes>
+          </object>
+        </child>
+        <child>
+          <object class="GtkLabel">
+            <property name="visible">True</property>
+            <property name="label" translatable="yes">Extensions can cause system issues, including performance problems. If you encounter problems with your system, it is recommended to disable all extensions.</property>
+            <property name="wrap">True</property>
+            <property name="max_width_chars">40</property>
+            <property name="xalign">0</property>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
   <template class="ExtensionsWindow" parent="GtkApplicationWindow">
     <property name="default_width">800</property>
     <property name="default_height">500</property>
@@ -10,6 +48,18 @@
         <property name="visible">True</property>
         <property name="title" translatable="yes">Shell Extensions</property>
         <property name="show_close_button">True</property>
+        <child>
+          <object class="GtkMenuButton">
+            <property name="visible">True</property>
+            <property name="popover">infoPopover</property>
+            <child>
+              <object class="GtkImage">
+                <property name="visible">True</property>
+                <property name="icon_name">dialog-information-symbolic</property>
+              </object>
+            </child>
+          </object>
+        </child>
         <child>
           <object class="GtkSwitch" id="killSwitch">
             <property name="visible">True</property>