Adjust remarkup rule precedence for embeds

Summary: The monospaced rule should still have higher precedence than these
rules, so use flat text tests to cover some rule interactions.

Auditors: btrahan

src/applications/diviner/markup/DivinerRemarkupRuleSymbol.php

@@ -5,7 +5,7 @@ final class DivinerRemarkupRuleSymbol extends PhutilRemarkupRule {
   const KEY_RULE_ATOM_REF = 'rule.diviner.atomref';
 
   public function getPriority() {
-    return 40.0;
+    return 200.0;
   }
 
   public function apply($text) {
@@ -34,6 +34,10 @@ final class DivinerRemarkupRuleSymbol extends PhutilRemarkupRule {
   }
 
   public function markupSymbol($matches) {
+    if ($this->isTextFlat($matches[0])) {
+      return $matches[0];
+    }
+
     $type = (string)idx($matches, 'type');
     $name = (string)$matches['name'];
     $title = (string)idx($matches, 'title');

src/applications/macro/remarkup/PhabricatorRemarkupRuleIcon.php

@@ -4,7 +4,7 @@ final class PhabricatorRemarkupRuleIcon
   extends PhutilRemarkupRule {
 
   public function getPriority() {
-    return 50.0;
+    return 200.0;
   }
 
   public function apply($text) {
@@ -15,6 +15,10 @@ final class PhabricatorRemarkupRuleIcon
   }
 
   public function markupIcon($matches) {
+    if (!$this->isFlatText($matches[0])) {
+      return $matches[0];
+    }
+
     $extra = idx($matches, 1);
 
     // We allow various forms, like these:

src/applications/macro/remarkup/PhabricatorRemarkupRuleMeme.php

@@ -9,7 +9,7 @@ final class PhabricatorRemarkupRuleMeme
   private $images;
 
   public function getPriority() {
-    return 50.0;
+    return 200.0;
   }
 
   public function apply($text) {
@@ -20,6 +20,10 @@ final class PhabricatorRemarkupRuleMeme
   }
 
   public function markupMeme($matches) {
+    if (!$this->isFlatText($matches[0])) {
+      return $matches[0];
+    }
+
     $options = array(
       'src' => null,
       'above' => null,

src/infrastructure/markup/rule/PhabricatorRemarkupRuleObject.php

@@ -13,7 +13,7 @@ abstract class PhabricatorRemarkupRuleObject
   abstract protected function loadObjects(array $ids);
 
   public function getPriority() {
-    return 50.0;
+    return 200.0;
   }
 
   protected function getObjectNamePrefixBeginsWithWordCharacter() {
@@ -133,6 +133,10 @@ abstract class PhabricatorRemarkupRuleObject
   }
 
   public function markupObjectEmbed($matches) {
+    if (!$this->isFlatText($matches[0])) {
+      return $matches[0];
+    }
+
     return $this->markupObject(array(
       'type' => 'embed',
       'id' => $matches[1],
@@ -142,6 +146,10 @@ abstract class PhabricatorRemarkupRuleObject
   }
 
   public function markupObjectReference($matches) {
+    if (!$this->isFlatText($matches[0])) {
+      return $matches[0];
+    }
+
     return $this->markupObject(array(
       'type' => 'ref',
       'id' => $matches[1],