Make the command run a setting and change to flatpak

Author: leolost2605

data/gala.gschema.xml

@@ -76,6 +76,11 @@
       <summary></summary>
       <description></description>
     </key>
+    <key type="s" name="interactive-screenshot-action">
+      <default>'flatpak run io.elementary.screenshot'</default>
+      <summary>Interactive screenshot action</summary>
+      <description>Sets the command to run when the interactive-screenshot keybinding is pressed.</description>
+    </key>
     <key type="b" name="move-maximized-workspace">
       <default>false</default>
       <summary>Automatically move maximized windows to a new workspace</summary>

src/WindowManager.vala

@@ -518,11 +518,7 @@ namespace Gala {
                     screenshot_screen.begin ();
                     break;
                 case "interactive-screenshot":
-                    try {
-                        Process.spawn_command_line_async ("io.elementary.screenshot");
-                    } catch (Error e) {
-                        warning ("Failed to launch interactive screenshot: %s", e.message);
-                    }
+                    launch_action ("interactive-screenshot-action");
                     break;
                 case "area-screenshot":
                     screenshot_area.begin ();