Apply styles to referenced message

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -141,6 +141,7 @@ import org.jsoup.select.NodeFilter;
 import org.openintents.openpgp.OpenPgpError;
 import org.openintents.openpgp.util.OpenPgpApi;
 import org.openintents.openpgp.util.OpenPgpServiceConnection;
+import org.w3c.dom.css.CSSStyleSheet;
 
 import java.io.BufferedOutputStream;
 import java.io.File;
@@ -3567,8 +3568,19 @@ public class FragmentCompose extends FragmentBase {
                                 d.body().appendChild(div);
                             }
 
-                            // Quote referenced message body
                             Element e = d.body();
+
+                            // Apply styles
+                            List<CSSStyleSheet> sheets = HtmlHelper.parseStyles(d.head().select("style"));
+                            for (Element element : e.select("*")) {
+                                String tag = element.tagName();
+                                String clazz = element.attr("class");
+                                String style = HtmlHelper.processStyles(tag, clazz, null, sheets);
+                                style = HtmlHelper.mergeStyles(style, element.attr("style"));
+                                element.attr("style", style);
+                            }
+
+                            // Quote referenced message body
                             boolean quote_reply = prefs.getBoolean("quote_reply", true);
                             boolean quote = (quote_reply &&
                                     ("reply".equals(action) || "reply_all".equals(action) || "list".equals(action)));

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -485,11 +485,10 @@ public class HtmlHelper {
 
         // Sanitize styles
         for (Element element : document.select("*")) {
-            String style = null;
-            String clazz = element.attr("class");
-
             // Class style
-            style = processStyles(element.tagName(), clazz, style, sheets);
+            String tag = element.tagName();
+            String clazz = element.attr("class");
+            String style = processStyles(tag, clazz, null, sheets);
 
             // Element style
             style = mergeStyles(style, element.attr("style"));
@@ -1027,7 +1026,7 @@ public class HtmlHelper {
         return sheets;
     }
 
-    private static String processStyles(String tag, String clazz, String style, List<CSSStyleSheet> sheets) {
+    static String processStyles(String tag, String clazz, String style, List<CSSStyleSheet> sheets) {
         for (CSSStyleSheet sheet : sheets)
             if (isScreenMedia(sheet.getMedia())) {
                 style = processStyles(null, clazz, style, sheet.getCssRules(), Selector.SAC_ELEMENT_NODE_SELECTOR);
@@ -1093,7 +1092,7 @@ public class HtmlHelper {
         return false;
     }
 
-    private static String mergeStyles(String base, String style) {
+    static String mergeStyles(String base, String style) {
         return mergeStyles(base, style, null);
     }