Limit formatted message size based on memory class

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

@@ -22,6 +22,7 @@ package eu.faircode.email;
 import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_INDIVIDUAL;
 import static org.w3c.css.sac.Condition.SAC_CLASS_CONDITION;
 
+import android.app.ActivityManager;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.res.TypedArray;
@@ -362,6 +363,15 @@ public class HtmlHelper {
         }
     }
 
+    private static int getMaxFormatTextSize(Context context) {
+        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        int mc = am.getMemoryClass();
+        if (mc >= 256)
+            return MAX_FORMAT_TEXT_SIZE;
+        else
+            return mc * MAX_FORMAT_TEXT_SIZE / 256;
+    }
+
     private static Document sanitize(Context context, Document parsed, boolean view, boolean show_images) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         String theme = prefs.getString("theme", "blue_orange_system");
@@ -425,7 +435,7 @@ public class HtmlHelper {
         normalizeNamespaces(parsed, display_hidden);
 
         // Limit length
-        if (view && truncate(parsed, MAX_FORMAT_TEXT_SIZE)) {
+        if (view && truncate(parsed, getMaxFormatTextSize(context))) {
             parsed.body()
                     .appendElement("p")
                     .appendElement("em")
@@ -2200,7 +2210,7 @@ public class HtmlHelper {
     static String getText(Context context, String html) {
         Document d = sanitizeCompose(context, html, false);
 
-        truncate(d, MAX_FORMAT_TEXT_SIZE);
+        truncate(d, getMaxFormatTextSize(context));
 
         SpannableStringBuilder ssb = fromDocument(context, d, null, null);