VST3: Fix issue where Ardour would repeatedly try to resize editors

Ardour seems to listen to the bounds of the plugin window, and will call
`onSize` on the plugin editor when move/resize events are sent to the X
window - even if the size of the window didn't really change. This can
result in an infinite resize loop, where calling `onSize` on the VST3
instance sends a resize event to the plugin window, and this event
causes Ardour to call `onSize` on the plugin view.

To get around this, the Linux ComponentPeer will no longer request a
bounds change from the window system if the requested bounds are the
same as the current bounds.

modules/juce_gui_basics/native/juce_linux_Windowing.cpp

@@ -83,8 +83,13 @@ class LinuxComponentPeer  : public ComponentPeer
     //==============================================================================
     void setBounds (const Rectangle<int>& newBounds, bool isNowFullScreen) override
     {
-        bounds = newBounds.withSize (jmax (1, newBounds.getWidth()),
-                                     jmax (1, newBounds.getHeight()));
+        const auto correctedNewBounds = newBounds.withSize (jmax (1, newBounds.getWidth()),
+                                                            jmax (1, newBounds.getHeight()));
+
+        if (bounds == correctedNewBounds && fullScreen == isNowFullScreen)
+            return;
+
+        bounds = correctedNewBounds;
 
         updateScaleFactorFromNewBounds (bounds, false);