diff --git a/Cargo.lock b/Cargo.lock
index 05eb7ad6f..c9450ca1e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -35,7 +35,7 @@ checksum = "6945cc5422176fc5e602e590c2878d2c2acd9a4fe20a4baa7c28022521698ec6"
 [[package]]
 name = "atk"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "atk-sys",
  "bitflags",
@@ -46,7 +46,7 @@ dependencies = [
 [[package]]
 name = "atk-sys"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -105,7 +105,7 @@ checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
 [[package]]
 name = "cairo-rs"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "cairo-sys-rs",
@@ -117,7 +117,7 @@ dependencies = [
 [[package]]
 name = "cairo-sys-rs"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "glib-sys",
  "libc",
@@ -441,7 +441,7 @@ checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
 [[package]]
 name = "examples"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "anyhow",
  "byte-slice-cast",
@@ -608,7 +608,7 @@ dependencies = [
 [[package]]
 name = "gdk"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "bitflags",
  "cairo-rs",
@@ -623,7 +623,7 @@ dependencies = [
 [[package]]
 name = "gdk-pixbuf"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "gdk-pixbuf-sys",
@@ -635,7 +635,7 @@ dependencies = [
 [[package]]
 name = "gdk-pixbuf-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "gio-sys",
  "glib-sys",
@@ -647,7 +647,7 @@ dependencies = [
 [[package]]
 name = "gdk-sys"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "cairo-sys-rs",
  "gdk-pixbuf-sys",
@@ -673,7 +673,7 @@ dependencies = [
 [[package]]
 name = "gio"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "futures-channel",
@@ -689,7 +689,7 @@ dependencies = [
 [[package]]
 name = "gio-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -718,7 +718,7 @@ dependencies = [
 [[package]]
 name = "glib"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "futures-channel",
@@ -738,10 +738,10 @@ dependencies = [
 [[package]]
 name = "glib-macros"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "anyhow",
- "heck 0.4.0",
+ "heck",
  "proc-macro-crate",
  "proc-macro-error",
  "proc-macro2",
@@ -752,7 +752,7 @@ dependencies = [
 [[package]]
 name = "glib-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "libc",
  "system-deps",
@@ -833,7 +833,7 @@ dependencies = [
 [[package]]
 name = "gobject-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "glib-sys",
  "libc",
@@ -842,7 +842,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",
@@ -870,7 +870,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-app"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "futures-core",
@@ -888,7 +888,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-app-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-base-sys",
@@ -901,7 +901,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-audio"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "array-init",
  "bitflags",
@@ -918,7 +918,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-audio-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -932,7 +932,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-base"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",
@@ -945,7 +945,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-base-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -958,7 +958,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-check"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -969,7 +969,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-check-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -982,7 +982,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-controller"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -994,7 +994,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-controller-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1008,7 +1008,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-editing-services"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gio",
@@ -1023,7 +1023,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-editing-services-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gio-sys",
  "glib-sys",
@@ -1038,7 +1038,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "byteorder",
@@ -1055,7 +1055,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-egl"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gir-format-check",
  "glib",
@@ -1067,7 +1067,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-egl-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-gl-sys",
@@ -1079,7 +1079,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1094,7 +1094,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-wayland"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gir-format-check",
  "glib",
@@ -1106,7 +1106,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-wayland-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-gl-sys",
@@ -1118,7 +1118,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-x11"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gir-format-check",
  "glib",
@@ -1130,7 +1130,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-gl-x11-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-gl-sys",
@@ -1142,7 +1142,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-mpegts-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-base-sys",
@@ -1155,7 +1155,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-net"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gio",
  "gir-format-check",
@@ -1166,7 +1166,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-net-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gio-sys",
  "glib-sys",
@@ -1179,7 +1179,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-pbutils"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -1192,7 +1192,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-pbutils-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1207,7 +1207,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-player"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -1221,7 +1221,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-player-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1235,7 +1235,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtp"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -1248,7 +1248,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtp-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-base-sys",
@@ -1261,7 +1261,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtsp"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gir-format-check",
@@ -1274,7 +1274,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtsp-server"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "gio",
@@ -1291,7 +1291,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtsp-server-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gio-sys",
  "glib-sys",
@@ -1308,7 +1308,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-rtsp-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gio-sys",
  "glib-sys",
@@ -1323,7 +1323,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-sdp"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gir-format-check",
  "glib",
@@ -1333,7 +1333,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-sdp-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-sys",
@@ -1345,7 +1345,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1357,7 +1357,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-tag-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1370,7 +1370,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-video"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "bitflags",
  "cfg-if 1.0.0",
@@ -1389,7 +1389,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-video-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1403,7 +1403,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-webrtc"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "gir-format-check",
  "glib",
@@ -1415,7 +1415,7 @@ dependencies = [
 
 [[package]]
 name = "gstreamer-webrtc-sys"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "glib-sys",
  "gstreamer-sdp-sys",
@@ -1428,7 +1428,7 @@ dependencies = [
 [[package]]
 name = "gtk"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "atk",
  "bitflags",
@@ -1450,7 +1450,7 @@ dependencies = [
 [[package]]
 name = "gtk-sys"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "atk-sys",
  "cairo-sys-rs",
@@ -1467,7 +1467,7 @@ dependencies = [
 [[package]]
 name = "gtk3-macros"
 version = "0.15.3"
-source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#176a97ac92a06f37f5e0567e1fd7090c707b3314"
+source = "git+https://github.com/gtk-rs/gtk3-rs?branch=0.15#ae1455d9c2ed6209dc16df4021c604fa136308ae"
 dependencies = [
  "anyhow",
  "proc-macro-crate",
@@ -1477,15 +1477,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "heck"
-version = "0.3.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
-dependencies = [
- "unicode-segmentation",
-]
-
 [[package]]
 name = "heck"
 version = "0.4.0"
@@ -1914,7 +1905,7 @@ dependencies = [
 [[package]]
 name = "pango"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "glib",
@@ -1926,7 +1917,7 @@ dependencies = [
 [[package]]
 name = "pango-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "glib-sys",
  "gobject-sys",
@@ -1937,7 +1928,7 @@ dependencies = [
 [[package]]
 name = "pangocairo"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "bitflags",
  "cairo-rs",
@@ -1950,7 +1941,7 @@ dependencies = [
 [[package]]
 name = "pangocairo-sys"
 version = "0.15.4"
-source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#b9a17b84e2dd460792ad5adb30e4f804b4b36793"
+source = "git+https://github.com/gtk-rs/gtk-rs-core?branch=0.15#ec496cbbc55cd0969b76787526c9d02febfca72f"
 dependencies = [
  "cairo-sys-rs",
  "glib-sys",
@@ -2337,12 +2328,12 @@ dependencies = [
 
 [[package]]
 name = "system-deps"
-version = "6.0.0"
+version = "6.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b1487aaddaacbc5d60a2a507ba1617c5ca66c57dd0dd07d0c5efd5b693841d4"
+checksum = "ad3a97fdef3daf935d929b3e97e5a6a680cd4622e40c2941ca0875d6566416f8"
 dependencies = [
  "cfg-expr",
- "heck 0.3.3",
+ "heck",
  "pkg-config",
  "toml",
  "version-compare",
@@ -2416,7 +2407,7 @@ dependencies = [
 
 [[package]]
 name = "tutorials"
-version = "0.18.2"
+version = "0.18.3"
 dependencies = [
  "anyhow",
  "byte-slice-cast",
@@ -2438,12 +2429,6 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
-[[package]]
-name = "unicode-segmentation"
-version = "1.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
-
 [[package]]
 name = "unicode-xid"
 version = "0.2.2"