`xml.etree.ElementTree` — doesn't allow specifying fine-grained formatting controls

(Note: I already have a PR and this is a tracking issue.)

Enhancement

XML is maddening from a Git perspective, as if multiple tools will edit it, you'll get lots of lines in the diff that aren't needed.

For example:

diff --git a/sources/designspace/Besley.designspace b/sources/designspace/Besley.designspace
index d247944..eecb985 100644
--- a/sources/designspace/Besley.designspace
+++ b/sources/designspace/Besley.designspace
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version='1.0' encoding='UTF-8'?>

And:

diff --git a/sources/designspace/Besley.designspace b/sources/designspace/Besley.designspace
index d247944..9d570dd 100644
--- a/sources/designspace/Besley.designspace
+++ b/sources/designspace/Besley.designspace
@@ -10,15 +10,15 @@
       <map input="800" output="766"/>
       <map input="900" output="900"/>
     </axis>
-    <axis tag="wdth" name="Width" minimum="75" maximum="100" default="100"></axis>
+    <axis tag="wdth" name="Width" minimum="75" maximum="100" default="100" />
   </axes>
 
   <sources>
 
     <source filename="../ufo/Besley-Book.ufo" name="Besley Regular" familyname="Besley" stylename="Regular">
       <location>
-        <dimension name="Weight" xvalue="400"/>
-        <dimension name="Width" xvalue="100"/>
+        <dimension name="Weight" xvalue="400" />
+        <dimension name="Width" xvalue="100" />
       </location>
     </source>
 

There are likely other issues, but I only needed to solve these two.

Commencez par examiner la pull request existante mentionnée dans l’issue ainsi que le comportement de formatage de xml.etree.ElementTree qu’elle modifie. Le travail sera terminé lorsque les appelants pourront contrôler indépendamment la mise entre guillemets de la déclaration XML et le formatage des éléments vides, avec une couverture pour les deux exemples présentés.