Signals: Fix invalid connections to missing callbacks

These bugs existed since those lines were added, so I assume that
their intended use is no longer relevant.

editor/groups_editor.cpp

@@ -29,6 +29,7 @@
 /*************************************************************************/
 
 #include "groups_editor.h"
+
 #include "editor/scene_tree_editor.h"
 #include "editor_node.h"
 #include "editor_scale.h"
@@ -468,7 +469,6 @@ GroupDialog::GroupDialog() {
 	nodes_to_add->set_select_mode(Tree::SELECT_MULTI);
 	nodes_to_add->set_v_size_flags(SIZE_EXPAND_FILL);
 	nodes_to_add->add_constant_override("draw_guides", 1);
-	nodes_to_add->connect_compat("item_selected", this, "_nodes_to_add_selected");
 
 	HBoxContainer *add_filter_hbc = memnew(HBoxContainer);
 	add_filter_hbc->add_constant_override("separate", 0);
@@ -515,7 +515,6 @@ GroupDialog::GroupDialog() {
 	nodes_to_remove->set_hide_folding(true);
 	nodes_to_remove->set_select_mode(Tree::SELECT_MULTI);
 	nodes_to_remove->add_constant_override("draw_guides", 1);
-	nodes_to_remove->connect_compat("item_selected", this, "_node_to_remove_selected");
 
 	HBoxContainer *remove_filter_hbc = memnew(HBoxContainer);
 	remove_filter_hbc->add_constant_override("separate", 0);

editor/plugins/animation_player_editor_plugin.cpp

@@ -38,10 +38,8 @@
 #include "editor/animation_track_editor.h"
 #include "editor/editor_scale.h"
 #include "editor/editor_settings.h"
-
-// For onion skinning.
-#include "editor/plugins/canvas_item_editor_plugin.h"
-#include "editor/plugins/spatial_editor_plugin.h"
+#include "editor/plugins/canvas_item_editor_plugin.h" // For onion skinning.
+#include "editor/plugins/spatial_editor_plugin.h" // For onion skinning.
 #include "scene/main/viewport.h"
 #include "servers/visual_server.h"
 
@@ -375,8 +373,7 @@ void AnimationPlayerEditor::_animation_save_in_path(const Ref<Resource> &p_resou
 	Error err = ResourceSaver::save(path, p_resource, flg | ResourceSaver::FLAG_REPLACE_SUBRESOURCE_PATHS);
 
 	if (err != OK) {
-		accept->set_text(TTR("Error saving resource!"));
-		accept->popup_centered_minsize();
+		EditorNode::get_singleton()->show_warning(TTR("Error saving resource!"));
 		return;
 	}
 
@@ -1628,10 +1625,6 @@ AnimationPlayerEditor::AnimationPlayerEditor(EditorNode *p_editor, AnimationPlay
 	scale->set_tooltip(TTR("Scale animation playback globally for the node."));
 	scale->hide();
 
-	accept = memnew(AcceptDialog);
-	add_child(accept);
-	accept->connect_compat("confirmed", this, "_menu_confirm_current");
-
 	delete_dialog = memnew(ConfirmationDialog);
 	add_child(delete_dialog);
 	delete_dialog->connect_compat("confirmed", this, "_animation_remove_confirmed");

editor/plugins/animation_player_editor_plugin.h

@@ -110,7 +110,6 @@ class AnimationPlayerEditor : public VBoxContainer {
 	float timeline_position;
 
 	EditorFileDialog *file;
-	AcceptDialog *accept;
 	ConfirmationDialog *delete_dialog;
 	int current_option;
 

editor/plugins/cpu_particles_editor_plugin.cpp

@@ -51,12 +51,6 @@ void CPUParticlesEditor::_menu_option(int p_option) {
 
 	switch (p_option) {
 
-		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH: {
-
-			emission_file_dialog->popup_centered_ratio();
-
-		} break;
-
 		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE: {
 
 			emission_tree_dialog->popup_centered_ratio();
@@ -112,7 +106,6 @@ CPUParticlesEditor::CPUParticlesEditor() {
 	particles_editor_hb->hide();
 
 	options->set_text(TTR("CPUParticles"));
-	options->get_popup()->add_item(TTR("Create Emission Points From Mesh"), MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH);
 	options->get_popup()->add_item(TTR("Create Emission Points From Node"), MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE);
 	options->get_popup()->add_separator();
 	options->get_popup()->add_item(TTR("Restart"), MENU_OPTION_RESTART);

editor/plugins/cpu_particles_editor_plugin.h

@@ -41,7 +41,6 @@ class CPUParticlesEditor : public ParticlesEditorBase {
 	enum Menu {
 
 		MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE,
-		MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH,
 		MENU_OPTION_CLEAR_EMISSION_VOLUME,
 		MENU_OPTION_RESTART
 

editor/plugins/particles_editor_plugin.cpp

@@ -231,23 +231,9 @@ ParticlesEditorBase::ParticlesEditorBase() {
 	emission_dialog->get_ok()->set_text(TTR("Create"));
 	emission_dialog->connect_compat("confirmed", this, "_generate_emission_points");
 
-	emission_file_dialog = memnew(EditorFileDialog);
-	add_child(emission_file_dialog);
-	emission_file_dialog->connect_compat("file_selected", this, "_resource_seleted");
 	emission_tree_dialog = memnew(SceneTreeDialog);
 	add_child(emission_tree_dialog);
 	emission_tree_dialog->connect_compat("selected", this, "_node_selected");
-
-	List<String> extensions;
-	ResourceLoader::get_recognized_extensions_for_type("Mesh", &extensions);
-
-	emission_file_dialog->clear_filters();
-	for (int i = 0; i < extensions.size(); i++) {
-
-		emission_file_dialog->add_filter("*." + extensions[i] + " ; " + extensions[i].to_upper());
-	}
-
-	emission_file_dialog->set_mode(EditorFileDialog::MODE_OPEN_FILE);
 }
 
 void ParticlesEditor::_node_removed(Node *p_node) {
@@ -279,17 +265,6 @@ void ParticlesEditor::_menu_option(int p_option) {
 				generate_seconds->set_value(trunc(gen_time) + 1.0);
 			generate_aabb->popup_centered_minsize();
 		} break;
-		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH: {
-
-			Ref<ParticlesMaterial> material = node->get_process_material();
-			if (material.is_null()) {
-				EditorNode::get_singleton()->show_warning(TTR("A processor material of type 'ParticlesMaterial' is required."));
-				return;
-			}
-			emission_file_dialog->popup_centered_ratio();
-
-		} break;
-
 		case MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE: {
 			Ref<ParticlesMaterial> material = node->get_process_material();
 			if (material.is_null()) {
@@ -467,7 +442,6 @@ ParticlesEditor::ParticlesEditor() {
 	options->set_text(TTR("Particles"));
 	options->get_popup()->add_item(TTR("Generate AABB"), MENU_OPTION_GENERATE_AABB);
 	options->get_popup()->add_separator();
-	options->get_popup()->add_item(TTR("Create Emission Points From Mesh"), MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH);
 	options->get_popup()->add_item(TTR("Create Emission Points From Node"), MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE);
 	options->get_popup()->add_separator();
 	options->get_popup()->add_item(TTR("Convert to CPUParticles"), MENU_OPTION_CONVERT_TO_CPU_PARTICLES);

editor/plugins/particles_editor_plugin.h

@@ -46,7 +46,6 @@ protected:
 	MenuButton *options;
 	HBoxContainer *particles_editor_hb;
 
-	EditorFileDialog *emission_file_dialog;
 	SceneTreeDialog *emission_tree_dialog;
 
 	ConfirmationDialog *emission_dialog;
@@ -77,7 +76,6 @@ class ParticlesEditor : public ParticlesEditorBase {
 
 		MENU_OPTION_GENERATE_AABB,
 		MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_NODE,
-		MENU_OPTION_CREATE_EMISSION_VOLUME_FROM_MESH,
 		MENU_OPTION_CLEAR_EMISSION_VOLUME,
 		MENU_OPTION_CONVERT_TO_CPU_PARTICLES,
 		MENU_OPTION_RESTART,