Added a new plugin_refresher module. It's only a skeleton for now. Same idea as the godot-plugin-refresher addon, but done a bit differently.

modules/plugin_refresher/SCsub

@@ -0,0 +1,11 @@
+import os
+
+Import('env')
+
+module_env = env.Clone()
+
+module_env.add_source_files(env.modules_sources,"register_types.cpp")
+
+if env["tools"]:
+    module_env.add_source_files(env.modules_sources,"plugin_refresher_editor_plugin.cpp")
+    module_env.add_source_files(env.modules_sources,"plugin_refresher.cpp")

modules/plugin_refresher/config.py

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+
+
+def can_build(env, platform):
+  return True
+
+
+def configure(env):
+	pass
+
+
+def get_doc_classes():
+    return [
+    ]
+
+def get_doc_path():
+    return "doc_classes"

modules/plugin_refresher/plugin_refresher.cpp

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+
+#include "plugin_refresher.h"
+#include "core/os/input_event.h"
+
+#include "editor/editor_settings.h"
+#include "scene/gui/check_box.h"
+
+void PluginRefresher::set_enabled(const bool p_enabled) {
+	if (_enabler_check_box) {
+		_enabler_check_box->set_pressed(p_enabled);
+	}
+
+	_set_enabled(p_enabled);
+}
+
+void PluginRefresher::set_enabler_check_box(CheckBox *cb) {
+	_enabler_check_box = cb;
+
+	if (_enabler_check_box) {
+		_enabler_check_box->connect("toggled", this, "_set_enabled");
+	}
+}
+
+void PluginRefresher::_set_enabled(const bool p_enabled) {
+	set_visible(p_enabled);
+
+	bool sett_enabled = EditorSettings::get_singleton()->get_project_metadata("plugin_refresher", "enabled", false);
+
+	if (sett_enabled != p_enabled) {
+		EditorSettings::get_singleton()->set_project_metadata("plugin_refresher", "enabled", p_enabled);
+	}
+}
+
+void PluginRefresher::pressed() {
+	if (_button == BUTTON_LEFT) {
+	} else if (_button == BUTTON_RIGHT) {
+	}
+}
+void PluginRefresher::_gui_input(Ref<InputEvent> p_event) {
+	Ref<InputEventMouseButton> mouse_button = p_event;
+
+	if (mouse_button.is_valid()) {
+		_button = mouse_button->get_button_index();
+	}
+
+	BaseButton::_gui_input(p_event);
+}
+
+PluginRefresher::PluginRefresher() {
+	_button = 0;
+	set_button_mask(BUTTON_MASK_LEFT | BUTTON_MASK_RIGHT);
+	set_enabled_focus_mode(FOCUS_NONE);
+	set_tooltip("Left click: Refresh selected plugin.\nRight click: Settings.");
+}
+
+PluginRefresher::~PluginRefresher() {
+}
+
+void PluginRefresher::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("_set_enabled", "enabled"), &PluginRefresher::_set_enabled);
+}

modules/plugin_refresher/plugin_refresher.h

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+#ifndef PLUGIN_REFRESHER_H
+#define PLUGIN_REFRESHER_H
+
+#include "core/reference.h"
+#include "core/ustring.h"
+#include "core/variant.h"
+#include "core/vector.h"
+
+#include "scene/gui/tool_button.h"
+
+class CheckBox;
+
+class PluginRefresher : public ToolButton {
+	GDCLASS(PluginRefresher, ToolButton);
+
+public:
+	void set_enabled(const bool p_enabled);
+
+	void set_enabler_check_box(CheckBox *cb);
+
+	PluginRefresher();
+	~PluginRefresher();
+
+protected:
+	void _set_enabled(const bool p_enabled);
+
+	void pressed();
+	void _gui_input(Ref<InputEvent> p_event);
+
+	static void _bind_methods();
+
+	int _button;
+	CheckBox *_enabler_check_box;
+};
+
+#endif

modules/plugin_refresher/plugin_refresher_editor_plugin.cpp

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+/*
+Copyright (c) 2019-2022 Péter Magyar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "plugin_refresher_editor_plugin.h"
+
+#include "editor/editor_node.h"
+#include "editor/editor_plugin_settings.h"
+#include "editor/editor_settings.h"
+#include "editor/project_settings_editor.h"
+#include "plugin_refresher.h"
+#include "scene/gui/check_box.h"
+
+String PluginRefresherEditorPlugin::get_name() const {
+	return "PluginRefresherEditorPlugin";
+}
+
+PluginRefresherEditorPlugin::PluginRefresherEditorPlugin(EditorNode *p_node) {
+	editor = p_node;
+
+	_enable_check_box = memnew(CheckBox);
+	_enable_check_box->set_text(TTR("Show Refresher"));
+
+	_plugin_refresher = memnew(PluginRefresher);
+	_plugin_refresher->set_icon(get_editor_interface()->get_base_control()->get_icon("Reload", "EditorIcons"));
+
+	_plugin_refresher->set_enabler_check_box(_enable_check_box);
+
+	add_control_to_container(CONTAINER_TOOLBAR, _plugin_refresher);
+	ProjectSettingsEditor::get_singleton()->get_plugin_settings()->add_control_to_top_bar(_enable_check_box);
+
+	bool enabled = EditorSettings::get_singleton()->get_project_metadata("plugin_refresher", "enabled", false);
+	_plugin_refresher->set_enabled(enabled);
+}
+
+PluginRefresherEditorPlugin::~PluginRefresherEditorPlugin() {
+}
+
+void PluginRefresherEditorPlugin::_bind_methods() {
+}

modules/plugin_refresher/plugin_refresher_editor_plugin.h

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+#ifndef PLUGIN_REFRESHER_EDITOR_PLUGIN_H
+#define PLUGIN_REFRESHER_EDITOR_PLUGIN_H
+
+/*
+Copyright (c) 2019-2022 Péter Magyar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "core/reference.h"
+#include "editor/editor_plugin.h"
+
+class CheckBox;
+class PluginRefresher;
+
+class PluginRefresherEditorPlugin : public EditorPlugin {
+	GDCLASS(PluginRefresherEditorPlugin, EditorPlugin);
+
+public:
+	String get_name() const;
+
+	PluginRefresherEditorPlugin(EditorNode *p_node);
+	~PluginRefresherEditorPlugin();
+
+	EditorNode *editor;
+
+protected:
+	static void _bind_methods();
+
+	CheckBox *_enable_check_box;
+	PluginRefresher *_plugin_refresher;
+};
+
+#endif

modules/plugin_refresher/register_types.cpp

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+/*
+Copyright (c) 2022 Péter Magyar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include "register_types.h"
+
+#ifdef TOOLS_ENABLED
+#include "plugin_refresher_editor_plugin.h"
+#endif
+
+void register_plugin_refresher_types() {
+#ifdef TOOLS_ENABLED
+	EditorPlugins::add_by_type<PluginRefresherEditorPlugin>();
+#endif
+}
+
+void unregister_plugin_refresher_types() {
+}

modules/plugin_refresher/register_types.h

@@ -0,0 +1,24 @@
+/*
+Copyright (c) 2022 Péter Magyar
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+void register_plugin_refresher_types();
+void unregister_plugin_refresher_types();