dwm 6.8 focusguard patch

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+# focusguard
+
+## Description
+
+This patch keeps focus on a fullscreen client when a new window appears. It
+applies to dwm 6.8.
+
+`manage()` calls `focus(NULL)` for every new client on the selected monitor,
+so Steam update dialogs, chat windows and notifications pull focus off a
+running fullscreen game. Many games then drop fullscreen. With this patch the
+fullscreen client stays selected and focused. The new client is still
+attached, arranged and mapped, and can be reached after the game leaves
+fullscreen or by switching tags.
+
+## Configuration
+
+The patch uses the existing `lockfullscreen` option in `config.h`. Set it to
+0 to disable the behaviour. No new options are added.
+
+## Testing
+
+Applies and builds against dwm 6.8. Runtime tested under Xvfb: with a
+fullscreen client focused, a new window no longer becomes
+`_NET_ACTIVE_WINDOW`.
+
+## Download
+
+* [dwm-focusguard-6.8.diff](dwm-focusguard-6.8.diff)
+
+## Author
+
+* Daniel Guihot - [daniel@guihot.net](mailto:daniel@guihot.net)