Add flags.similar filter variable (#5747)

src/controllers/filters/lang/Filter.cpp

@@ -36,6 +36,7 @@ const QMap<QString, Type> MESSAGE_TYPING_CONTEXT{
     {"flags.restricted", Type::Bool},
     {"flags.monitored", Type::Bool},
     {"flags.shared", Type::Bool},
+    {"flags.similar", Type::Bool},
     {"message.content", Type::String},
     {"message.length", Type::Int},
     {"reward.title", Type::String},
@@ -144,6 +145,7 @@ ContextMap buildContextMap(const MessagePtr &m, chatterino::Channel *channel)
         {"flags.restricted", m->flags.has(MessageFlag::RestrictedMessage)},
         {"flags.monitored", m->flags.has(MessageFlag::MonitoredMessage)},
         {"flags.shared", m->flags.has(MessageFlag::SharedMessage)},
+        {"flags.similar", m->flags.has(MessageFlag::Similar)},
 
         {"message.content", m->messageText},
         {"message.length", m->messageText.length()},

src/controllers/filters/lang/Tokenizer.cpp

@@ -44,6 +44,7 @@ const QMap<QString, QString> VALID_IDENTIFIERS_MAP{
     {"flags.restricted", "restricted message?"},
     {"flags.monitored", "monitored message?"},
     {"flags.shared", "shared message?"},
+    {"flags.similar", "r9k filtered message?"},
     {"message.content", "message text"},
     {"message.length", "message length"},
     {"reward.title", "point reward title"},

src/widgets/settingspages/GeneralPage.cpp

@@ -945,13 +945,14 @@ void GeneralPage::initLayout(GeneralPageView &layout)
         toggleLocalr9kShortcut = toggleLocalr9kSeq.toString(
             QKeySequence::SequenceFormat::NativeText);
     }
-    layout.addDescription("Hide similar messages. Toggle hidden "
-                          "messages by pressing " +
-                          toggleLocalr9kShortcut + ".");
-    layout.addCheckbox("Hide similar messages", s.similarityEnabled);
+    layout.addDescription(
+        "Hide similar messages to those previously seen. Toggle hidden "
+        "messages by pressing " +
+        toggleLocalr9kShortcut + ".");
+    layout.addCheckbox("Enable similarity checks", s.similarityEnabled);
     //layout.addCheckbox("Gray out matches", s.colorSimilarDisabled);
     layout.addCheckbox(
-        "By the same user", s.hideSimilarBySameUser, false,
+        "Only if by the same user", s.hideSimilarBySameUser, false,
         "When checked, messages that are very similar to each other can still "
         "be shown as long as they're sent by different users.");
     layout.addCheckbox("Hide my own messages", s.hideSimilarMyself);
@@ -968,7 +969,7 @@ void GeneralPage::initLayout(GeneralPageView &layout)
             return QString::number(val);
         },
         [](auto args) {
-            return fuzzyToFloat(args.value, 0.9f);
+            return fuzzyToFloat(args.value, 0.9F);
         },
         true,
         "A value of 0.9 means the messages need to be 90% similar to be marked "
@@ -993,7 +994,11 @@ void GeneralPage::initLayout(GeneralPageView &layout)
         },
         [](auto args) {
             return fuzzyToInt(args.value, 3);
-        });
+        },
+        true,
+        "How many messages in the history should be compared to a new one to "
+        "establish its similarity rating. Messages in the history will be "
+        "compared to only if they are new enough.");
 
     layout.addSubtitle("Visible badges");
     layout.addCheckbox("Authority", s.showBadgesGlobalAuthority, false,