ui: set popup window minimum size before showing it

* avoid flickering, when window is resized immediately after being shown

platform/platform-impl/src/com/intellij/ui/popup/AbstractPopup.java

@@ -973,12 +973,13 @@ public class AbstractPopup implements JBPopup {
       myContent.getRootPane().putClientProperty("SIMPLE_WINDOW", "SIMPLE_WINDOW".equals(data));
     }
 
+    myWindow = window;
+    setMinimumSize(myMinSize);
+
     myPopup.show();
 
     WindowAction.setEnabledFor(myPopup.getWindow(), myResizable);
 
-    myWindow = window;
-
     myWindowListener = new MyWindowListener();
     window.addWindowListener(myWindowListener);
 
@@ -991,8 +992,6 @@ public class AbstractPopup implements JBPopup {
       }
     }
 
-    setMinimumSize(myMinSize);
-
     final Runnable afterShow = () -> {
       if (isDisposed()) {
         LOG.debug("popup is disposed after showing");