feature/pgtk 3f8f3a9: Create a variable to enable selection on multi display

[Yuuki Harano]

branch: feature/pgtk
commit 3f8f3a9027a1de28899725f0fecdc4f1f33c1479
Author: Yuuki Harano <masm+github@masm11.me>
Commit: Yuuki Harano <masm+github@masm11.me>

    Create a variable to enable selection on multi display
    
    * src/pgtkselect.c (pgtk_selection_usable): If it is true, always
    returns true.
    (syms_of_pgtkselect): New bool variable.
---
 src/pgtkselect.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/pgtkselect.c b/src/pgtkselect.c
index 7b7bc69..8ab7474 100644
--- a/src/pgtkselect.c
+++ b/src/pgtkselect.c
@@ -235,6 +235,9 @@ pgtk_selection_lost (GtkWidget * widget, GdkEventSelection 
* event,
 static bool
 pgtk_selection_usable (void)
 {
+  if (pgtk_enable_selection_on_multi_display)
+    return true;
+
   /*
    * 
https://github.com/GNOME/gtk/blob/gtk-3-24/gdk/wayland/gdkselection-wayland.c#L1033
    *
@@ -639,4 +642,9 @@ to convert into a type that we don't know about or that is 
inappropriate.\n\
 This hook doesn't let you change the behavior of Emacs's selection replies,\n\
 it merely informs you that they have happened.");
   Vpgtk_sent_selection_hooks = Qnil;
+
+  DEFVAR_BOOL ("pgtk-enable-selection-on-multi-display", 
pgtk_enable_selection_on_multi_display,
+              doc: /* Enable selection on multi display environment.
+This may cause crash.  */);
+  pgtk_enable_selection_on_multi_display = false;
 }