TextEditor: Default to Text style on style absence

The current default is black foreground, which is invisible on dark color
schemes.

Change-Id: Id9dbc6ac7377816666887096c28fa0008291ddac
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/texteditor/fontsettings.cpp

@@ -320,8 +320,12 @@ bool FontSettings::loadColorScheme(const QString &fileName,
         const TextStyle id = desc.id();
         if (!m_scheme.contains(id)) {
             Format format;
-            format.setForeground(desc.foreground());
-            format.setBackground(desc.background());
+            if (desc.format() == format && m_scheme.contains(C_TEXT)) {
+                format = m_scheme.formatFor(C_TEXT); // Default format -> Text
+            } else {
+                format.setForeground(desc.foreground());
+                format.setBackground(desc.background());
+            }
             format.setBold(desc.format().bold());
             format.setItalic(desc.format().italic());
             format.setUnderlineColor(desc.format().underlineColor());