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Bug#867667: xsane: Preview window empty/unusable

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  Bug#867667: xsane: Preview window empty/unusable Jozef Riha <jose1711@gmail.com> - 2020-09-23 12:30 +0200

#1026122 — Bug#867667: xsane: Preview window empty/unusable

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I am on Arch Linux but affected by the very same issue. There is another
workaround that worked for me:
running with --sync (i. e. xsane --sync)

Looks like the preview window gets created on each startup and then later -
corresponding to settings -
either it's left as is or hidden. Maybe if it's happening too fast (w/o
sync) this leads to corruption.

Quick and dirty semi-solution (certainly not ideal but al least working
100%) is to discard the hiding part (that is:
ignore the setting at startup):

--- xsane.c.orig 2020-09-23 12:14:13.366814683 +0200
+++ xsane.c 2020-09-23 12:14:17.106792054 +0200
@@ -5347,10 +5347,10 @@
   {
     gtk_widget_show(xsane.preview->top);
   }
-  else
-  {
-    gtk_widget_hide(xsane.preview->top);
-  }
+  //else
+  //{
+    //gtk_widget_hide(xsane.preview->top);
+  //}

 gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(xsane.show_preview_widget),
xsane.show_preview);

   xsane_define_maximum_output_size(); /* draw maximum output frame in
preview window if necessary */

I do hope someone knowledgeable steps in and prepare a proper fix.

BR, jose

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