kconfig_update for auto border size introduction

Summary:
If a user has set his border size explicitly in the past also respect this
selection with the new auto border size mode by setting auto borders to
false on update.

For this a kconf_update file and a sed based shell script is added.

Test Plan: Manually.

Reviewers: #kwin, davidedmundson

Reviewed By: #kwin, davidedmundson

Subscribers: zzag, davidedmundson, kwin

Tags: #kwin

Maniphest Tasks: T8707

Differential Revision: https://phabricator.kde.org/D13480

kconf_update/CMakeLists.txt

@@ -1,2 +1,4 @@
 install(FILES kwin.upd
         DESTINATION ${KDE_INSTALL_KCONFUPDATEDIR})
+install(PROGRAMS kwin-5.16-auto-bordersize.sh
+        DESTINATION ${KDE_INSTALL_KCONFUPDATEDIR})

kconf_update/kwin-5.16-auto-bordersize.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+HAS_SIZE=''
+HAS_AUTO=''
+
+while read -r line
+do
+  # substring from beginning to equal sign
+  ENTRY="${line%%=*}"
+  if [ "$ENTRY" = "BorderSize" ]; then
+    HAS_SIZE=1
+  fi
+  if [ "$ENTRY" = "BorderSizeAuto" ]; then
+    HAS_AUTO=1
+  fi
+  echo "$line"
+done
+
+if [ -n "$HAS_SIZE" -a -z "$HAS_AUTO" ]; then
+  # unset auto borders if user has set a border
+  # size in the past (for good measure make
+  # also sure auto borders are not yet set)
+  echo "BorderSizeAuto=false"
+fi

kconf_update/kwin.upd

@@ -25,3 +25,9 @@ Id=port-dimscreen-effect-to-js
 File=kwinrc
 Group=Plugins
 Key=dimscreenEnabled,kwin4_effect_dimscreenEnabled
+
+# Deactivate auto border size if the user has changed border size in the past
+Id=auto-bordersize
+File=kwinrc
+Group=org.kde.kdecoration2
+Script=kwin-5.16-auto-bordersize.sh,sh