@@ -481,6 +481,8 @@ <li><p><code>task_icon = boolean (0 or 1)</code> : Whether to display the task icon. There is no explicit option to control the task icon size; it depends on the vertical padding set with <code>task_padding</code>.</p></li>
 <li><p><code>task_text = boolean (0 or 1)</code> : Whether to display the task text.</p></li>
 <li><p><code>task_centered = boolean (0 or 1)</code> : Whether the task text is centered.</p></li>
 <li><p><code>task_tooltip = boolean (0 or 1)</code> : Whether to show tooltips for tasks.</p></li>
+<li><p><code>task_thumbnail = boolean (0 or 1)</code> : Whether to show thumbnail tooltips for tasks.</p></li>
+<li><p><code>task_thumbnail_size = width</code> : Thumbnail size.</p></li>
 <li><p><code>task_maximum_size = width height</code></p>
 <ul>
 <li><code>width</code> is used with horizontal panels to limit the size of the tasks. Use <code>width = 0</code> to get full taskbar width.</li>

@@ -508,6 +508,10 @@ \fB\fCtask_centered = boolean (0 or 1)\fR : Whether the task text is centered.
 .IP \(bu 2
 \fB\fCtask_tooltip = boolean (0 or 1)\fR : Whether to show tooltips for tasks.
 .IP \(bu 2
+\fB\fCtask_thumbnail = boolean (0 or 1)\fR : Whether to show thumbnail tooltips for tasks.
+.IP \(bu 2
+\fB\fCtask_thumbnail_size = width\fR : Thumbnail size.
+.IP \(bu 2
 \fB\fCtask_maximum_size = width height\fR
 .RS
 .IP \(bu 2

@@ -409,6 +409,10 @@ * `task_centered = boolean (0 or 1)` : Whether the task text is centered.
 
   * `task_tooltip = boolean (0 or 1)` : Whether to show tooltips for tasks.
 
+  * `task_thumbnail = boolean (0 or 1)` : Whether to show thumbnail tooltips for tasks.
+
+  * `task_thumbnail_size = width` : Thumbnail size.
+
   * `task_maximum_size = width height`
     * `width` is used with horizontal panels to limit the size of the tasks. Use `width = 0` to get full taskbar width.
     * `height` is used with vertical panels.

@@ -1091,6 +1091,10 @@ }
     // "tooltip" is deprecated but here for backwards compatibility
     else if (strcmp(key, "task_tooltip") == 0 || strcmp(key, "tooltip") == 0)
         panel_config.g_task.tooltip_enabled = atoi(value);
+    else if (strcmp(key, "task_thumbnail") == 0)
+        panel_config.g_task.thumbnail_enabled = atoi(value);
+    else if (strcmp(key, "task_thumbnail_size") == 0)
+        panel_config.g_task.thumbnail_width = MAX(8, atoi(value));
 
     /* Systray */
     else if (strcmp(key, "systray_padding") == 0) {

@@ -50,6 +50,8 @@ }
 
 cairo_surface_t *task_get_thumbnail(void *obj)
 {
+    if (!panel_config.g_task.thumbnail_enabled)
+        return NULL;
     Task *t = (Task *)obj;
     if (!t->thumbnail)
         task_refresh_thumbnail(t);
@@ -620,12 +622,14 @@ }
 
 void task_refresh_thumbnail(Task *task)
 {
+    if (!panel_config.g_task.thumbnail_enabled)
+        return;
     if (task->current_state == TASK_ICONIFIED)
         return;
     double now = get_time();
     if (now - task->thumbnail_last_update < 0.1)
         return;
-    cairo_surface_t *thumbnail = get_window_thumbnail(task->win);
+    cairo_surface_t *thumbnail = get_window_thumbnail(task->win, panel_config.g_task.thumbnail_width);
     if (!thumbnail)
         return;
     if (task->thumbnail)

@@ -46,6 +46,8 @@ PangoFontDescription *font_desc;
     Color font[TASK_STATE_COUNT];
     int config_font_mask;
     gboolean tooltip_enabled;
+    gboolean thumbnail_enabled;
+    int thumbnail_width;
 } GlobalTask;
 
 // Stores information about a task.

@@ -46,7 +46,7 @@ gboolean hide_taskbar_if_empty;
 gboolean always_show_all_desktop_tasks;
 TaskbarSortMethod taskbar_sort_method;
 Alignment taskbar_alignment;
-static timeout *thumbnail_update_timer = NULL;
+static timeout *thumbnail_update_timer;
 
 static GList *taskbar_task_orderings = NULL;
 
@@ -85,6 +85,7 @@ hide_inactive_tasks = FALSE;
     hide_task_diff_monitor = FALSE;
     hide_taskbar_if_empty = FALSE;
     always_show_all_desktop_tasks = FALSE;
+    thumbnail_update_timer = NULL;
     taskbar_sort_method = TASKBAR_NOSORT;
     taskbar_alignment = ALIGN_LEFT;
     default_taskbarname();
@@ -362,6 +363,8 @@ }
 
 void taskbar_start_thumbnail_timer()
 {
+    if (!panel_config.g_task.thumbnail_enabled)
+        return;
     change_timeout(&thumbnail_update_timer, 100, 10 * 1000, taskbar_update_thumbnails, NULL);
 }
 
@@ -792,6 +795,8 @@ }
 
 void taskbar_update_thumbnails(void *arg)
 {
+    if (!panel_config.g_task.thumbnail_enabled)
+        return;
     for (int i = 0; i < num_panels; i++) {
         Panel *panel = &panels[i];
         for (int j = 0; j < panel->num_desktops; j++) {

@@ -97,7 +97,7 @@ GtkWidget *systray_background, *systray_monitor, *systray_name_filter;
 
 // tooltip
 GtkWidget *tooltip_padding_x, *tooltip_padding_y, *tooltip_font, *tooltip_font_set, *tooltip_font_color;
-GtkWidget *tooltip_task_show, *tooltip_show_after, *tooltip_hide_after;
+GtkWidget *tooltip_task_show, *tooltip_show_after, *tooltip_hide_after, *tooltip_task_thumbnail, *tooltip_task_thumbnail_size;
 GtkWidget *clock_format_tooltip, *clock_tmz_tooltip;
 GtkWidget *tooltip_background;
 
@@ -3287,6 +3287,36 @@ tooltip_task_show,
                          _("If enabled, a tooltip showing the window title is displayed when the mouse cursor moves "
                            "over task buttons."),
                          NULL);
+
+    row++, col = 2;
+    label = gtk_label_new(_("Thumbnails"));
+    gtk_misc_set_alignment(GTK_MISC(label), 0, 0);
+    gtk_widget_show(label);
+    gtk_table_attach(GTK_TABLE(table), label, col, col + 1, row, row + 1, GTK_FILL, 0, 0, 0);
+    col++;
+
+    tooltip_task_thumbnail = gtk_check_button_new();
+    gtk_widget_show(tooltip_task_thumbnail);
+    gtk_table_attach(GTK_TABLE(table), tooltip_task_thumbnail, col, col + 1, row, row + 1, GTK_FILL, 0, 0, 0);
+    col++;
+    gtk_tooltips_set_tip(tooltips,
+                         tooltip_task_thumbnail,
+                         _("If enabled, a tooltip showing the window thumbnail is displayed when the mouse cursor moves "
+                           "over task buttons."),
+                         NULL);
+
+    row++, col = 2;
+    label = gtk_label_new(_("Thumbnail size"));
+    gtk_misc_set_alignment(GTK_MISC(label), 0, 0);
+    gtk_widget_show(label);
+    gtk_table_attach(GTK_TABLE(table), label, col, col + 1, row, row + 1, GTK_FILL, 0, 0, 0);
+    col++;
+
+    tooltip_task_thumbnail_size = gtk_spin_button_new_with_range(8, 9000, 1);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(tooltip_task_thumbnail_size), 210);
+    gtk_widget_show(tooltip_task_thumbnail_size);
+    gtk_table_attach(GTK_TABLE(table), tooltip_task_thumbnail_size, col, col + 1, row, row + 1, GTK_FILL, 0, 0, 0);
+    col++;
 
     row++, col = 2;
     label = gtk_label_new(_("Maximum width"));

@@ -105,7 +105,7 @@ extern GtkWidget *systray_background, *systray_monitor, *systray_name_filter;
 
 // tooltip
 extern GtkWidget *tooltip_padding_x, *tooltip_padding_y, *tooltip_font, *tooltip_font_set, *tooltip_font_color;
-extern GtkWidget *tooltip_task_show, *tooltip_show_after, *tooltip_hide_after;
+extern GtkWidget *tooltip_task_show, *tooltip_show_after, *tooltip_hide_after, *tooltip_task_thumbnail, *tooltip_task_thumbnail_size;
 extern GtkWidget *clock_format_tooltip, *clock_tmz_tooltip;
 extern GtkWidget *tooltip_background;
 

@@ -517,6 +517,11 @@ (int)gtk_spin_button_get_value(GTK_SPIN_BUTTON(task_spacing)));
     if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(task_font_set)))
         fprintf(fp, "task_font = %s\n", gtk_font_button_get_font_name(GTK_FONT_BUTTON(task_font)));
     fprintf(fp, "task_tooltip = %d\n", gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tooltip_task_show)) ? 1 : 0);
+    fprintf(fp, "task_thumbnail = %d\n", gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tooltip_task_thumbnail)) ? 1 : 0);
+    fprintf(fp,
+            "task_thumbnail_size = %d\n",
+            (int)gtk_spin_button_get_value(GTK_SPIN_BUTTON(tooltip_task_thumbnail_size)));
+
 
     // same for: "" _normal _active _urgent _iconified
     if (gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(task_default_color_set))) {
@@ -1732,6 +1737,10 @@ // "tooltip" is deprecated but here for backwards compatibility
     else if (strcmp(key, "task_tooltip") == 0 || strcmp(key, "tooltip") == 0) {
         gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(tooltip_task_show), atoi(value));
     }
+    else if (strcmp(key, "task_thumbnail") == 0)
+        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(tooltip_task_thumbnail), atoi(value));
+    else if (strcmp(key, "task_thumbnail_size") == 0)
+        gtk_spin_button_set_value(GTK_SPIN_BUTTON(tooltip_task_thumbnail_size), MAX(8, atoi(value1)));
 
     /* Systray */
     else if (strcmp(key, "systray") == 0) {

@@ -357,7 +357,7 @@ XFree(text_property.value);
     return result;
 }
 
-cairo_surface_t *get_window_thumbnail(Window win)
+cairo_surface_t *get_window_thumbnail(Window win, int size)
 {
     XWindowAttributes wa;
     if (!XGetWindowAttributes(server.display, win, &wa))
@@ -369,7 +369,7 @@ 
     int tw, th;
     double sx, sy;
     double ox, oy;
-    tw = 210;
+    tw = size;
     th = h * tw / w;
     if (th > tw * 0.618) {
         th = (int)(tw * 0.618);

@@ -34,6 +34,6 @@ int get_icon_count(gulong *data, int num);
 gulong *get_best_icon(gulong *data, int icon_count, int num, int *iw, int *ih, int best_icon_size);
 
 char *get_window_name(Window win);
-cairo_surface_t *get_window_thumbnail(Window win);
+cairo_surface_t *get_window_thumbnail(Window win, int size);
 
 #endif

@@ -1,4 +1,4 @@ 
-#---- Generated by tint2conf d8b1 ----
+#---- Generated by tint2conf aeaf ----
 # See https://gitlab.com/o9000/tint2/wikis/Configure for 
 # full documentation of the configuration options.
 #-------------------------------------
@@ -115,6 +115,8 @@ urgent_nb_of_blink = 100000
 task_maximum_size = 150 35
 task_padding = 2 2 4
 task_tooltip = 1
+task_thumbnail = 0
+task_thumbnail_size = 210
 task_font_color = #ffffff 100
 task_background_id = 2
 task_active_background_id = 3