Bug 1613960 - Remove artificial text indent from CSS declarations in Changes panel. r=pbro

For people who want to copy the plain text CSS declarations in the Changes panel, we prevent including the +/- diff signs in the selection. We did preserve the text indent. This patch removes the text indent as well.

Differential Revision: https://phabricator.services.mozilla.com/D62052

--HG--
extra : moz-landing-system : lando

devtools/client/inspector/changes/components/CSSDeclaration.js

@@ -28,7 +28,6 @@ class CSSDeclaration extends PureComponent {
 
     return dom.div(
       { className: `changes__declaration ${className}` },
-      "  ", // Two spaces indent when copying plain text to clipboard
       dom.span(
         { className: "changes__declaration-name theme-fg-color3" },
         property

devtools/client/themes/changes.css

@@ -169,8 +169,7 @@
 }
 
 .changes__declaration-name {
-  /* Counteract double space used for indentation when text is copied to clipboard */
-  margin-left: -4px;
+  margin-left: 10px;
 }
 
 .diff-add,