[gegl] bin: keep zoomed fit on window resize

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 663f36021d7d71f559083894afa982d1ea625898
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jan 30 00:56:46 2019 +0100

    bin: keep zoomed fit on window resize

 bin/ui.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/bin/ui.c b/bin/ui.c
index a7dda845e..462af4f3f 100644
--- a/bin/ui.c
+++ b/bin/ui.c
@@ -5010,6 +5010,21 @@ static void gegl_ui (Mrg *mrg, void *data)
   else
   {
     o->is_dir = 0;
+
+    { /* keep zoomed fit on resize */
+      static int prev_width = 0;
+      static int prev_height = 0;
+      int width = mrg_width (mrg);
+      int height = mrg_height (mrg);
+
+      if (o->is_fit && prev_width &&
+          (width != prev_width || height != prev_height))
+      {
+        argvs_eval ("zoom fit");
+      }
+      prev_width = width;
+      prev_height = height;
+    }
   }
 
   if (o->is_dir)