[libadwaita/wip/exalm/tab-fixes: 2/5] tab-box: Measure the background gizmo

[Alexander Mikhaylenko <alexm src gnome org>]

commit 2331dde93d66ee975ddbef2ed18256be2d8a4b1b
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Dec 27 15:01:48 2021 +0500

    tab-box: Measure the background gizmo

 src/adw-tab-box.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/src/adw-tab-box.c b/src/adw-tab-box.c
index 6b895a8a..3064f6c1 100644
--- a/src/adw-tab-box.c
+++ b/src/adw-tab-box.c
@@ -2799,12 +2799,15 @@ adw_tab_box_measure (GtkWidget      *widget,
   AdwTabBox *self = ADW_TAB_BOX (widget);
   int min, nat;
 
+  gtk_widget_measure (self->background, orientation, -1,
+                      &min, &nat, NULL, NULL);
+
   if (self->n_tabs == 0) {
     if (minimum)
-      *minimum = 0;
+      *minimum = min;
 
     if (natural)
-      *natural = 0;
+      *natural = nat;
 
     if (minimum_baseline)
       *minimum_baseline = -1;
@@ -2832,7 +2835,10 @@ adw_tab_box_measure (GtkWidget      *widget,
     if (!self->pinned)
       width -= OVERLAP;
 
-    min = nat = MAX (self->last_width, width);
+    width = MAX (self->last_width, width);
+
+    min = MAX (min, width);
+    nat = MAX (nat, width);
   } else {
     GList *l;
 
@@ -2879,8 +2885,6 @@ adw_tab_box_size_allocate (GtkWidget *widget,
   int pos;
   double value;
 
-  gtk_widget_measure (self->background, GTK_ORIENTATION_HORIZONTAL, -1,
-                      NULL, NULL, NULL, NULL);
   gtk_widget_allocate (self->background, width, height, baseline, NULL);
 
   adw_tab_box_measure (widget, GTK_ORIENTATION_HORIZONTAL, -1,