Bug 1646669 - Fix CodeMirror secondary cursor color. r=Itiel.

Differential Revision: https://phabricator.services.mozilla.com/D82346

devtools/client/themes/dark-theme.css

@@ -198,6 +198,9 @@ body {
 .cm-s-mozilla .CodeMirror-lines .CodeMirror-cursor {
   border-left: solid 1px #fff;
 }
+.cm-s-mozilla .CodeMirror-lines .CodeMirror-cursor.CodeMirror-secondarycursor {
+  border-left-color: #aaa;
+}
 
 .cm-s-mozilla.CodeMirror-focused .CodeMirror-selected { /* selected text (focused) */
   background: var(--theme-selection-background-hover);

devtools/client/themes/light-theme.css

@@ -186,7 +186,7 @@ body {
   color: var(--theme-body-color);
 }
 
-.cm-s-mozilla .CodeMirror-lines .CodeMirror-cursor {
+.cm-s-mozilla .CodeMirror-lines .CodeMirror-cursor:not(.CodeMirror-secondarycursor) {
   border-left: solid 1px black;
 }