Announce the set of lines changed in commits

Currently this is only populated when commits are amended, for the
simple reason that it's the only time that AssFile knows what lines
changed. It is probably worth expanding this in the future.

aegisub/libaegisub/include/libaegisub/signal.h

@@ -215,6 +215,18 @@ public:
 	UnscopedConnection Connect(void (T::*func)(Arg1, Arg2), T* a1) {
 		return Connect(std::bind(func, a1, _1, _2));
 	}
+
+	/// @brief Connect a member function with the correct signature to this signal
+	/// @param func Function to connect
+	/// @param a1   Object
+	///
+	/// This overload is purely for convenience so that classes can do
+	/// sig.Connect(&Class::Foo, this) rather than
+	/// sig.Connect(&Class::Foo, this, _1)
+	template<class T>
+	UnscopedConnection Connect(void (T::*func)(Arg1), T* a1) {
+		return Connect(std::bind(func, a1, _1));
+	}
 };
 
 /// @class Signal

aegisub/src/ass_file.cpp

@@ -372,6 +372,10 @@ void AssFile::AddToRecent(wxString const& file) const {
 }
 
 int AssFile::Commit(wxString const& desc, int type, int amendId, AssEntry *single_line) {
+	std::set<const AssEntry*> changed_lines;
+	if (single_line)
+		changed_lines.insert(single_line);
+
 	++commitId;
 	// Allow coalescing only if it's the last change and the file has not been
 	// saved since the last change
@@ -389,7 +393,7 @@ int AssFile::Commit(wxString const& desc, int type, int amendId, AssEntry *singl
 		else {
 			UndoStack.back() = *this;
 		}
-		AnnounceCommit(type);
+		AnnounceCommit(type, changed_lines);
 		return commitId;
 	}
 
@@ -408,7 +412,7 @@ int AssFile::Commit(wxString const& desc, int type, int amendId, AssEntry *singl
 	if (UndoStack.size() > 1 && OPT_GET("App/Auto/Save on Every Change")->GetBool() && !filename.empty() && CanSave())
 		Save(filename);
 
-	AnnounceCommit(type);
+	AnnounceCommit(type, changed_lines);
 	return commitId;
 }
 
@@ -420,7 +424,7 @@ void AssFile::Undo() {
 	UndoStack.pop_back();
 	*this = UndoStack.back();
 
-	AnnounceCommit(COMMIT_NEW);
+	AnnounceCommit(COMMIT_NEW, std::set<const AssEntry*>());
 }
 
 void AssFile::Redo() {
@@ -430,7 +434,7 @@ void AssFile::Redo() {
 	UndoStack.push_back(*this);
 	RedoStack.pop_back();
 
-	AnnounceCommit(COMMIT_NEW);
+	AnnounceCommit(COMMIT_NEW, std::set<const AssEntry*>());
 }
 
 wxString AssFile::GetUndoDescription() const {

aegisub/src/ass_file.h

@@ -33,14 +33,12 @@
 ///
 
 #include <boost/container/list.hpp>
-
+#include <boost/intrusive/list.hpp>
 #include <set>
 #include <vector>
 
 #include <wx/arrstr.h>
 
-#include <boost/intrusive/list.hpp>
-
 #include <libaegisub/signal.h>
 
 #include "ass_entry.h"
@@ -65,7 +63,7 @@ class AssFile {
 	int autosavedCommitId;
 
 	/// A set of changes has been committed to the file (AssFile::CommitType)
-	agi::signal::Signal<int> AnnounceCommit;
+	agi::signal::Signal<int, std::set<const AssEntry*> const&> AnnounceCommit;
 	/// A new file has been opened (filename)
 	agi::signal::Signal<wxString> FileOpen;
 	/// The file is about to be saved

aegisub/src/audio_karaoke.cpp

@@ -118,8 +118,8 @@ void AudioKaraoke::OnActiveLineChanged(AssDialogue *new_line) {
 	}
 }
 
-void AudioKaraoke::OnFileChanged(int type) {
+void AudioKaraoke::OnFileChanged(int type, std::set<const AssEntry *> const& changed) {
-	if (enabled && (type & AssFile::COMMIT_DIAG_FULL)) {
+	if (enabled && (type & AssFile::COMMIT_DIAG_FULL) && (changed.empty() || changed.count(active_line))) {
 		LoadFromLine();
 		split_area->Refresh(false);
 	}

aegisub/src/audio_karaoke.h

@@ -30,6 +30,7 @@
 #include <libaegisub/signal.h>
 
 class AssDialogue;
+class AssEntry;
 class AssKaraoke;
 class wxButton;
 
@@ -136,7 +137,7 @@ class AudioKaraoke : public wxWindow {
 	void OnActiveLineChanged(AssDialogue *new_line);
 	void OnContextMenu(wxContextMenuEvent&);
 	void OnEnableButton(wxCommandEvent &evt);
-	void OnFileChanged(int type);
+	void OnFileChanged(int type, std::set<const AssEntry *> const& changed);
 	void OnMouse(wxMouseEvent &event);
 	void OnPaint(wxPaintEvent &event);
 	void OnSize(wxSizeEvent &event);