osc: OSC-1 does not set the icon, it sets the icon _label_

In fact, there appears there *is* no escape sequence to set the icon.

Keep most of the logic in place, but in practice, we'll always set the
icon to the app-id. That is, at startup, we set it to the configured
app-id (either from config, or the command line).

OSC-176, which sets the app-id, also updates the icon (to the app-id).

csi.c

@@ -1377,10 +1377,6 @@ csi_dispatch(struct terminal *term, uint8_t final)
                     tll_push_back(
                         term->window_title_stack, xstrdup(term->window_title));
                 }
-                if (what == 0 || what == 1) {
-                    tll_push_back(
-                        term->window_icon_stack, xstrdup(term->window_icon));
-                }
                 break;
             }
 
@@ -1394,13 +1390,6 @@ csi_dispatch(struct terminal *term, uint8_t final)
                         free(title);
                     }
                 }
-                if (what == 0 || what == 1) {
-                    if (tll_length(term->window_icon_stack) > 0) {
-                        char *icon = tll_pop_back(term->window_icon_stack);
-                        term_set_icon(term, icon);
-                        free(icon);
-                    }
-                }
                 break;
             }
 

osc.c

@@ -1147,11 +1147,9 @@ osc_dispatch(struct terminal *term)
     switch (param) {
     case 0:  /* icon + title */
         term_set_window_title(term, string);
-        term_set_icon(term, string);
         break;
 
     case 1:  /* icon */
-        term_set_icon(term, string);
         break;
 
     case 2:  /* title */

terminal.c

@@ -1814,9 +1814,7 @@ term_destroy(struct terminal *term)
     composed_free(term->composed);
 
     free(term->app_id);
-    free(term->window_icon);
     free(term->window_title);
-    tll_free_and_free(term->window_icon_stack, free);
     tll_free_and_free(term->window_title_stack, free);
 
     for (size_t i = 0; i < sizeof(term->fonts) / sizeof(term->fonts[0]); i++)
@@ -2048,9 +2046,7 @@ term_reset(struct terminal *term, bool hard)
     term->saved_charsets = term->charsets;
     tll_free_and_free(term->window_title_stack, free);
     term_set_window_title(term, term->conf->title);
-    tll_free_and_free(term->window_icon_stack, free);
     term_set_app_id(term, NULL);
-    term_set_icon(term, NULL);
 
     term_set_user_mouse_cursor(term, NULL);
 
@@ -3610,39 +3606,19 @@ term_set_app_id(struct terminal *term, const char *app_id)
     render_refresh_icon(term);
 }
 
-void
-term_set_icon(struct terminal *term, const char *icon)
-{
-    if (icon != NULL && *icon == '\0')
-        icon = NULL;
-    if (term->window_icon == NULL && icon == NULL)
-        return;
-    if (term->window_icon != NULL && icon != NULL && streq(term->window_icon, icon))
-        return;
-
-    if (icon != NULL && !is_valid_utf8(icon)) {
-        LOG_WARN("%s: icon label is not valid UTF-8, ignoring", icon);
-        return;
-    }
-
-    free(term->window_icon);
-    if (icon != NULL) {
-        term->window_icon = xstrdup(icon);
-    } else {
-        term->window_icon = NULL;
-    }
-    render_refresh_icon(term);
-}
-
 const char *
 term_icon(const struct terminal *term)
 {
     const char *app_id =
         term->app_id != NULL ? term->app_id : term->conf->app_id;
 
-    return term->window_icon != NULL
+    return
+#if 0
+term->window_icon != NULL
         ? term->window_icon
-        : streq(app_id, "footclient")
+        :
+        #endif
+        streq(app_id, "footclient")
             ? "foot"
             : app_id;
 }

terminal.h

@@ -552,8 +552,8 @@ struct terminal {
     bool window_title_has_been_set;
     char *window_title;
     tll(char *) window_title_stack;
-    char *window_icon;
-    tll(char *)window_icon_stack;
+    //char *window_icon;  /* No escape sequence available to set the icon */
+    //tll(char *)window_icon_stack;
     char *app_id;
 
     struct {
@@ -932,7 +932,6 @@ void term_set_user_mouse_cursor(struct terminal *term, const char *cursor);
 
 void term_set_window_title(struct terminal *term, const char *title);
 void term_set_app_id(struct terminal *term, const char *app_id);
-void term_set_icon(struct terminal *term, const char *icon);
 const char *term_icon(const struct terminal *term);
 void term_flash(struct terminal *term, unsigned duration_ms);
 void term_bell(struct terminal *term);