[tepl] TabLabel: ellipsize ourself the label text

[Sébastien Wilmet <swilmet src gnome org>]

commit 839cde620fad1a7af0f64666a2a47388a43e9bd4
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Aug 6 09:30:25 2017 +0200

    TabLabel: ellipsize ourself the label text

 tepl/tepl-tab-label.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)
---
diff --git a/tepl/tepl-tab-label.c b/tepl/tepl-tab-label.c
index 98d7fd3..2bc681e 100644
--- a/tepl/tepl-tab-label.c
+++ b/tepl/tepl-tab-label.c
@@ -21,6 +21,7 @@
 #include "tepl-tab.h"
 #include "tepl-buffer.h"
 #include "tepl-signal-group.h"
+#include "tepl-utils.h"
 
 /**
  * SECTION:tab-label
@@ -47,6 +48,8 @@ enum
 
 static GParamSpec *properties[N_PROPERTIES];
 
+#define MAX_LABEL_CHARS_LENGTH (42)
+
 G_DEFINE_TYPE_WITH_PRIVATE (TeplTabLabel, tepl_tab_label, GTK_TYPE_GRID)
 
 static void
@@ -54,12 +57,19 @@ update_label (TeplTabLabel *tab_label)
 {
        TeplBuffer *buffer;
        gchar *short_title;
+       gchar *truncated_short_title;
 
        buffer = tepl_tab_get_buffer (tab_label->priv->tab);
        short_title = tepl_buffer_get_short_title (buffer);
 
-       gtk_label_set_text (tab_label->priv->label, short_title);
+       /* A GtkNotebook tab label doesn't support well an ellipsizing GtkLabel.
+        * So, ellipsize ourself.
+        */
+       truncated_short_title = _tepl_utils_str_middle_truncate (short_title, MAX_LABEL_CHARS_LENGTH);
+
+       gtk_label_set_text (tab_label->priv->label, truncated_short_title);
 
+       g_free (truncated_short_title);
        g_free (short_title);
 }