[gnome-builder/wip/gtk4-port] libide/gui: remove transfer button

[Christian Hergert <chergert src gnome org>]

commit 21e2e90842f49b46ffdbf946a93d0d5e54563333
Author: Christian Hergert <chergert redhat com>
Date:   Mon Mar 28 18:57:40 2022 -0700

    libide/gui: remove transfer button
    
    We don't seem to even be using this widget, just remove it.

 src/libide/gui/ide-transfer-button.c | 247 -----------------------------------
 src/libide/gui/ide-transfer-button.h |  48 -------
 src/libide/gui/libide-gui.h          |   1 -
 src/libide/gui/meson.build           |   2 -
 4 files changed, 298 deletions(-)
---
diff --git a/src/libide/gui/libide-gui.h b/src/libide/gui/libide-gui.h
index 8cdb796da..4695ab6d7 100644
--- a/src/libide/gui/libide-gui.h
+++ b/src/libide/gui/libide-gui.h
@@ -53,7 +53,6 @@
 #include "ide-session-addin.h"
 #include "ide-surface.h"
 #include "ide-surfaces-button.h"
-#include "ide-transfer-button.h"
 #include "ide-transient-sidebar.h"
 #include "ide-workbench.h"
 #include "ide-workbench-addin.h"
diff --git a/src/libide/gui/meson.build b/src/libide/gui/meson.build
index f8d5d71aa..3a82a8b16 100644
--- a/src/libide/gui/meson.build
+++ b/src/libide/gui/meson.build
@@ -29,7 +29,6 @@ libide_gui_public_headers = [
   'ide-session-addin.h',
   'ide-surface.h',
   'ide-surfaces-button.h',
-  'ide-transfer-button.h',
   'ide-transient-sidebar.h',
   'ide-workbench.h',
   'ide-workbench-addin.h',
@@ -104,7 +103,6 @@ libide_gui_public_sources = [
   'ide-surface.c',
   'ide-surfaces-button.c',
   'ide-transient-sidebar.c',
-  'ide-transfer-button.c',
   'ide-workbench.c',
   'ide-workbench-addin.c',
   'ide-workspace.c',