[gnome-build-meta.wiki] Create Modifying GSettings at build time

[Tanvir Roshid <tanvirroshid src gnome org>]

commit 12c30e484a2f681b5a46de8bfd6756fd76370fed
Author: Tanvir Roshid <tanvirroshid786123 gmail com>
Date:   Fri Sep 16 12:07:23 2022 +0000

    Create Modifying GSettings at build time

 Modifying-GSettings-at-build-time.md | 45 ++++++++++++++++++++++++++++++++++++
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+### Explanation
+
+Our issue is that the original simulated resolution does not imitate a phone-like experience. After manual 
exploration, we realised the problem is the text-scaling-factor and its default 1.0 value. Further 
experimentation revealed that altering this value to 2.0 was ideal.
+
+The text-scaling-factor gets controlled by GSettings, which gets described conceptually as:
+
+- GSettings are a nice way to manage your application’s settings.
+- This system can be seen as a database, whose schema is described in an XML file (conventionally named 
.gschema.xml) which is then compiled to improve runtime performance.
+
+[The official site is here.](https://wiki.gnome.org/HowDoI/GSettings)
+
+### Override files
+We can define a `.override` file to replace the xml values for text scaling. Begin by creating a new 
directory in files called `gsettings` then adding updating text scaling can be done by creating a file 
`01_mobile.gschema.override` with contents
+```
+[org.gnome.desktop.interface]
+text-scaling-factor=1.5
+scaling-factor=1
+```
+
+### Importing override
+Creating a new custom element `elements/custom/gsettings.bst` we can import our override and recompile the 
gsettings schema by adding the contents:
+
+```
+kind: import
+
+sources:
+- kind: local
+  path: elements/custom/gsettings/src/01_mobile.gschema.override
+
+config:
+  source: /
+  target: /usr/share/glib-2.0/schemas/
+
+  public:
+    bst:
+      integration-commands:
+      - glib-compile-schemas usr/share/glib-2.0/schemas
+```
+
+### Add dependency
+
+We need to include this file into the image this can be done editing `deps.bst` to include
+```
+- custom/xml_editor/xml_editor.bst
+```
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