master 88545428f0: Handle deletion of opacity property too

[Po Lu]

branch: master
commit 88545428f0962081e776d903e05dd787677b320a
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Handle deletion of opacity property too
    
    * src/xterm.c (handle_one_xevent): Clear `alpha' frame parameter
    when opacity prop is gone or invalid.
---
 src/xterm.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/xterm.c b/src/xterm.c
index 5818eb1d02..c22a901ff4 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -14856,6 +14856,8 @@ handle_one_xevent (struct x_display_info *dpyinfo,
            {
              f->alpha[0] = 1.0;
              f->alpha[1] = 1.0;
+
+             store_frame_param (f, Qalpha, Qnil);
            }
          else
            {
@@ -14878,6 +14880,13 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 
                  store_frame_param (f, Qalpha, make_float (f->alpha[0]));
                }
+             else
+               {
+                 f->alpha[0] = 1.0;
+                 f->alpha[1] = 1.0;
+
+                 store_frame_param (f, Qalpha, Qnil);
+               }
            }
 
          if (tmp_data)