Fix crash when using search/replace with multiple windows

Have the dialog_manager manage the search/replace dialog like the other
dialogs.

src/command/edit.cpp

@@ -546,7 +546,7 @@ struct edit_find_replace final : public Command {
 
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
-		DialogSearchReplace::Show(c, true);
+		ShowSearchReplaceDialog(c, true);
 	}
 };
 

src/command/subtitle.cpp

@@ -95,7 +95,7 @@ struct subtitle_find final : public Command {
 
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
-		DialogSearchReplace::Show(c, false);
+		ShowSearchReplaceDialog(c, false);
 	}
 };
 
@@ -109,7 +109,7 @@ struct subtitle_find_next final : public Command {
 	void operator()(agi::Context *c) override {
 		c->videoController->Stop();
 		if (!c->search->FindNext())
-			DialogSearchReplace::Show(c, false);
+			ShowSearchReplaceDialog(c, false);
 	}
 };
 

src/dialog_search_replace.cpp

@@ -22,6 +22,7 @@
 #include "dialog_search_replace.h"
 
 #include "compat.h"
+#include "dialog_manager.h"
 #include "include/aegisub/context.h"
 #include "options.h"
 #include "search_replace_engine.h"
@@ -41,11 +42,11 @@
 #include <wx/textctrl.h>
 #include <wx/valgen.h>
 
-DialogSearchReplace::DialogSearchReplace(agi::Context* c, bool replace)
-: wxDialog(c->parent, -1, replace ? _("Replace") : _("Find"))
+template<bool has_replace>
+DialogSearchReplace<has_replace>::DialogSearchReplace(agi::Context* c)
+: wxDialog(c->parent, -1, has_replace ? _("Replace") : _("Find"))
 , c(c)
 , settings(std::make_unique<SearchReplaceSettings>())
-, has_replace(replace)
 {
 	auto recent_find(lagi_MRU_wxAS("Find"));
 	auto recent_replace(lagi_MRU_wxAS("Replace"));
@@ -127,10 +128,8 @@ DialogSearchReplace::DialogSearchReplace(agi::Context* c, bool replace)
 	replace_all->Bind(wxEVT_BUTTON, std::bind(&DialogSearchReplace::FindReplace, this, &SearchReplaceEngine::ReplaceAll));
 }
 
-DialogSearchReplace::~DialogSearchReplace() {
-}
-
-void DialogSearchReplace::FindReplace(bool (SearchReplaceEngine::*func)()) {
+template<bool has_replace>
+void DialogSearchReplace<has_replace>::FindReplace(bool (SearchReplaceEngine::*func)()) {
 	TransferDataFromWindow();
 
 	if (settings->find.empty())
@@ -168,27 +167,33 @@ static void update_mru(wxComboBox *cb, const char *mru_name) {
 	cb->Thaw();
 }
 
-void DialogSearchReplace::UpdateDropDowns() {
+template<bool has_replace>
+void DialogSearchReplace<has_replace>::UpdateDropDowns() {
 	update_mru(find_edit, "Find");
 
 	if (has_replace)
 		update_mru(replace_edit, "Replace");
 }
 
-void DialogSearchReplace::Show(agi::Context *context, bool replace) {
-	static DialogSearchReplace *diag = nullptr;
-
-	if (diag && replace != diag->has_replace) {
-		// Already opened, but wrong type - destroy and create the right one
-		diag->Destroy();
-		diag = nullptr;
+template<bool replace>
+void ShowSearchReplaceDialog(agi::Context *context) {
+	auto other = context->dialog->Get<DialogSearchReplace<!replace>>();
+	if (other != nullptr) {
+		other->Close();
 	}
 
-	if (!diag)
-		diag = new DialogSearchReplace(context, replace);
+	context->dialog->Show<DialogSearchReplace<replace>>(context);
+	auto dialog = context->dialog->Get<DialogSearchReplace<replace>>();
 
-	diag->find_edit->SetFocus();
-	diag->find_edit->SelectAll();
-	diag->wxDialog::Show();
-	diag->Raise();
+	dialog->find_edit->SetFocus();
+	dialog->find_edit->SelectAll();
+	dialog->Raise();
+}
+
+void ShowSearchReplaceDialog(agi::Context *context, bool replace) {
+	if (replace) {
+		ShowSearchReplaceDialog<true>(context);
+	} else {
+		ShowSearchReplaceDialog<false>(context);
+	}
 }

src/dialog_search_replace.h

@@ -28,19 +28,16 @@ class SearchReplaceEngine;
 struct SearchReplaceSettings;
 class wxComboBox;
 
+template<bool has_replace>
 class DialogSearchReplace final : public wxDialog {
 	agi::Context *c;
 	std::unique_ptr<SearchReplaceSettings> settings;
-	bool has_replace;
-	wxComboBox *find_edit;
 	wxComboBox *replace_edit;
 
 	void UpdateDropDowns();
 	void FindReplace(bool (SearchReplaceEngine::*func)());
 
 public:
-	static void Show(agi::Context *context, bool with_replace);
-
-	DialogSearchReplace(agi::Context* c, bool with_replace);
-	~DialogSearchReplace();
+	wxComboBox *find_edit;
+	DialogSearchReplace(agi::Context* c);
 };

src/dialogs.h

@@ -68,6 +68,7 @@ void ShowKanjiTimerDialog(agi::Context *c);
 void ShowLogWindow(agi::Context *c);
 void ShowPreferences(wxWindow *parent);
 void ShowPropertiesDialog(agi::Context *c);
+void ShowSearchReplaceDialog(agi::Context *c, bool replace);
 void ShowSelectLinesDialog(agi::Context *c);
 void ShowShiftTimesDialog(agi::Context *c);
 void ShowSpellcheckerDialog(agi::Context *c);