Use tilde pre-release versioning

gedit-plugins.spec

@@ -1,3 +1,5 @@
+%global tarball_version %%(echo %{version} | tr '~' '.')
+
 Name:           gedit-plugins
 Version:        40.0
 Release:        1%{?dist}
@@ -5,7 +7,7 @@ Summary:        Plugins for gedit
 
 License:        GPLv2+
 URL:            https://wiki.gnome.org/Apps/Gedit
-Source0:        https://download.gnome.org/sources/%{name}/40/%{name}-%{version}.tar.xz
+Source0:        https://download.gnome.org/sources/%{name}/40/%{name}-%{tarball_version}.tar.xz
 
 BuildRequires:  atk-devel
 BuildRequires:  cairo-devel
@@ -198,7 +200,7 @@ Requires:       %{name}-data = %{version}-%{release}
 The gedit wordcompletion plugin.
 
 %prep
-%autosetup -p1
+%autosetup -p1 -n %{name}-%{tarball_version}
 
 %build
 %meson \