Add tab indicator for working terminal tab

Author: lenemter

src/Application.vala

@@ -185,6 +185,8 @@ public class Terminal.Application : Gtk.Application {
 
             if (terminal != terminal.main_window.current_terminal) {
                 terminal.tab_state = tab_state;
+            } else if (terminal.tab_state == WORKING) {
+                terminal.tab_state = NONE;
             }
 
             if (!(get_active_window ().is_active)) {

src/MainWindow.vala

@@ -303,7 +303,9 @@ namespace Terminal {
                     return;
                 }
 
-                term.tab_state = NONE;
+                if (term.tab_state != WORKING) {
+                    term.tab_state = NONE;
+                }
             });
 
             notebook.tab_bar.bind_property ("tabs-revealed", new_tab_revealer, "reveal-child", SYNC_CREATE | INVERT_BOOLEAN);

src/Widgets/TerminalView.vala

@@ -170,8 +170,11 @@ public class Terminal.TerminalView : Granite.Bin {
         terminal_widget.tab = tab;
 
         terminal_widget.notify["tab-state"].connect (() => {
+            tab.loading = terminal_widget.tab_state == WORKING;
+
             switch (terminal_widget.tab_state) {
                 case NONE:
+                case WORKING:
                     tab.icon = null;
                     break;
                 case COMPLETED:

src/Widgets/TerminalWidget.vala

@@ -7,6 +7,7 @@ namespace Terminal {
     public class TerminalWidget : Vte.Terminal {
         public enum TabState {
             NONE,
+            WORKING,
             COMPLETED,
             ERROR
         }
@@ -233,6 +234,7 @@ namespace Terminal {
             notify["width-request"].connect (() => resized = true);
             contents_changed.connect (on_contents_changed);
             child_exited.connect (on_child_exited);
+            window_title_changed.connect (on_window_title_changed);
             ulong once = 0;
             once = realize.connect (() => {
                 clipboard = Gdk.Display.get_default ().get_clipboard ();
@@ -784,6 +786,14 @@ namespace Terminal {
             fg_pid = -1;
         }
 
+        private void on_window_title_changed () {
+            if (has_foreground_process ()) {
+                tab_state = WORKING;
+            }
+
+            // Application.dbus_register handles resetting the state
+        }
+
         public void kill_fg () {
             int fg_pid;
             if (this.try_get_foreground_pid (out fg_pid)) {