Added info button / expression conditions

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

@@ -135,6 +135,7 @@ public class FragmentRule extends FragmentBase {
     private CheckBox cbEveryDay;
     private EditText etYounger;
 
+    private ImageButton ibExpression;
     private EditText etExpression;
 
     private Spinner spAction;
@@ -343,6 +344,7 @@ public class FragmentRule extends FragmentBase {
         cbEveryDay = view.findViewById(R.id.cbEveryDay);
         etYounger = view.findViewById(R.id.etYounger);
 
+        ibExpression = view.findViewById(R.id.ibExpression);
         etExpression = view.findViewById(R.id.etExpression);
 
         spAction = view.findViewById(R.id.spAction);
@@ -683,6 +685,13 @@ public class FragmentRule extends FragmentBase {
             }
         });
 
+        ibExpression.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Helper.viewFAQ(v.getContext(), "expression_conditions");
+            }
+        });
+
         List<Action> actions = new ArrayList<>();
         actions.add(new Action(EntityRule.TYPE_NOOP, getString(R.string.title_rule_noop), R.drawable.twotone_remove_circle_outline_24));
         actions.add(new Action(EntityRule.TYPE_SEEN, getString(R.string.title_rule_seen), R.drawable.twotone_drafts_24));

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

@@ -1386,7 +1386,15 @@ public class Helper {
         viewFAQ(context, question, true /* Google translate */);
     }
 
+    static void viewFAQ(Context context, String fragment) {
+        viewFAQ(context, fragment, true);
+    }
+
     private static void viewFAQ(Context context, int question, boolean english) {
+        viewFAQ(context, question == 0 ? "top" : "faq" + question, english);
+    }
+
+    private static void viewFAQ(Context context, String fragment, boolean english) {
         // Redirection is done to prevent text editors from opening the link
         // https://email.faircode.eu/faq -> https://github.com/M66B/FairEmail/blob/master/FAQ.md
         // https://email.faircode.eu/docs -> https://github.com/M66B/FairEmail/tree/master/docs
@@ -1400,10 +1408,7 @@ public class Helper {
         else
             base = "https://email.faircode.eu/docs/FAQ-" + locale + ".md";
 
-        if (question == 0)
+        view(context, Uri.parse(base + "#" + fragment), "text/html", false, false);
-            view(context, Uri.parse(base + "#top"), "text/html", false, false);
-        else
-            view(context, Uri.parse(base + "#faq" + question), "text/html", false, false);
     }
 
     static Uri getPrivacyUri(Context context) {

app/src/main/res/layout/fragment_rule.xml

@@ -857,12 +857,25 @@
                     android:id="@+id/tvExpression"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
-                    android:layout_marginTop="12dp"
                     android:text="@string/title_rule_expression"
                     android:textAppearance="@style/TextAppearance.AppCompat.Small"
+                    app:layout_constraintBottom_toBottomOf="@+id/ibExpression"
+                    app:layout_constraintEnd_toStartOf="@id/ibExpression"
+                    app:layout_constraintStart_toStartOf="parent" />
+
+                <ImageButton
+                    android:id="@+id/ibExpression"
+                    android:layout_width="24dp"
+                    android:layout_height="24dp"
+                    android:layout_marginStart="6dp"
+                    android:layout_marginTop="12dp"
+                    android:layout_marginEnd="6dp"
+                    android:background="?android:attr/selectableItemBackgroundBorderless"
+                    android:contentDescription="@string/title_info"
                     app:layout_constraintEnd_toEndOf="parent"
-                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintStart_toEndOf="@id/tvExpression"
-                    app:layout_constraintTop_toBottomOf="@+id/vSeparatorExpression" />
+                    app:layout_constraintTop_toBottomOf="@+id/vSeparatorExpression"
+                    app:srcCompat="@drawable/twotone_info_24" />
 
                 <eu.faircode.email.EditTextPlain
                     android:id="@+id/etExpression"