Add button to pop out plugins panel v3 (#214)

* Add button to pop out plugins panel

The draggable plugins panel is impossible to discover for new users.
The added button pops out the plugins panel without opening it fully,
so that users can realize that the panel exists and is draggable.

* Add Ctrl+P shortcut to pop plugins in/out

vspreview/main/window.py

@@ -19,7 +19,7 @@
 
 from ..core import (
     PRELOADED_MODULES, AbstractQItem, ArInfo, CroppingInfo, DragNavigator, ExtendedWidget, Frame, GraphicsImageItem,
-    GraphicsView, HBoxLayout, MainVideoOutputGraphicsView, QAbstractYAMLObjectSingleton, StatusBar, Time, Timer,
+    GraphicsView, HBoxLayout, MainVideoOutputGraphicsView, PushButton, QAbstractYAMLObjectSingleton, StatusBar, Time, Timer,
     VBoxLayout, VideoOutput, _monkey_runpy_dicts, apply_plotting_style, dispose_environment, get_current_environment,
     make_environment
 )
@@ -187,6 +187,8 @@ def __init__(self, config_dir: SPath, no_exit: bool, reload_enabled: bool, force
 
         Plugins(self)
 
+        self.toolbars.main.layout().addWidget(PushButton("Plugins", clicked=self.pop_out_plugins))
+
         self.app_settings.tab_widget.setUsesScrollButtons(False)
         self.app_settings.setMinimumWidth(
             int(len(self.toolbars) * 1.05 * self.app_settings.tab_widget.geometry().width() / 2)
@@ -248,12 +250,27 @@ def setup_ui(self) -> None:
             self, activated=self.auto_fit_keyswitch
         )
 
+        QShortcut(
+            QKeySequence(QKeyCombination(Qt.Modifier.CTRL, Qt.Key.Key_P).toCombined()),
+            self, activated=self.pop_out_plugins
+        )
+
     def auto_fit_keyswitch(self) -> None:
         for view in self.graphics_views:
             if view.underMouse():
                 view.autofit = not view.autofit
                 break
 
+    def pop_out_plugins(self):
+        left, right = self.main_split.sizes()
+        if right:
+            new_sizes = [left + right, 0]
+        else:
+            min_right = int((left + right) * 0.2)
+            new_sizes = [min(left, left + right - min_right), max(right, min_right)]
+        self.main_split.setSizes(new_sizes)
+        self.plugins.update()
+
     def apply_stylesheet(self) -> None:
         try:
             from qdarkstyle import DarkPalette, LightPalette, _load_stylesheet  # type: ignore[import]