Fix some mostly unimportant uses of uninitialized memory

Originally committed to SVN as r6304.

aegisub/src/ass_file.cpp

@@ -147,8 +147,8 @@ void AssFile::Load(const wxString &_filename,wxString charset,bool addToRecent)
 	UndoStack.clear();
 	RedoStack.clear();
 	undoDescription.clear();
+	autosavedCommitId = savedCommitId = commitId + 1;
 	Commit("", COMMIT_NEW);
-	savedCommitId = commitId;
 
 	// Add to recent
 	if (addToRecent) AddToRecent(filename);
@@ -161,7 +161,7 @@ void AssFile::Save(wxString filename, bool setfilename, bool addToRecent, wxStri
 		throw "Unknown file type.";
 
 	if (setfilename) {
-		savedCommitId = commitId;
+		autosavedCommitId = savedCommitId = commitId;
 		this->filename = filename;
 		StandardPaths::SetPathValue("?script", wxFileName(filename).GetPath());
 	}
@@ -423,8 +423,8 @@ void AssFile::LoadDefault(bool defline) {
 	if (defline)
 		AddLine(AssDialogue().GetEntryData(), &version, &attach);
 
+	autosavedCommitId = savedCommitId = commitId + 1;
 	Commit("", COMMIT_NEW);
-	savedCommitId = commitId;
 	loaded = true;
 	StandardPaths::SetPathValue("?script", "");
 	FileOpen("");

aegisub/src/audio_renderer.cpp

@@ -79,7 +79,10 @@ size_t AudioRendererBitmapCacheBitmapFactory::GetBlockSize() const
 
 
 AudioRenderer::AudioRenderer()
-: cache_bitmap_width(32) // arbitrary value for now
+: pixel_samples(0)
+, pixel_height(0)
+, amplitude_scale(0)
+, cache_bitmap_width(32) // arbitrary value for now
 , cache_bitmap_maxsize(0)
 , cache_renderer_maxsize(0)
 , renderer(0)

aegisub/src/audio_renderer.h

@@ -279,7 +279,7 @@ protected:
 
 public:
 	/// @brief Constructor
-	AudioRendererBitmapProvider() : provider(0), pixel_samples(0) { };
+	AudioRendererBitmapProvider() : provider(0), pixel_samples(0), amplitude_scale(0) { };
 
 	/// @brief Destructor
 	virtual ~AudioRendererBitmapProvider() { }

aegisub/src/base_grid.cpp

@@ -911,6 +911,7 @@ void BaseGrid::SetColumnWidths() {
 	colWidth[6] = effectLen;
 	for (int i = 0; i < 3; i++)
 		colWidth[i + 7] = showMargin[i] ? marginLen : 0;
+	colWidth[10] = 1;
 
 	// Hide columns
 	for (int i = 0; i < columns; i++) {