Adjust textView frame size after scaling

CHANGELOG.md

@@ -13,6 +13,7 @@ Change Log
 ### Fixes
 
 - Fix text flickering while pinch-zoom.
+- Fix an issue in the editor where the bottom part of the editor became occasionally not responsive when the editor is zoomed-out.
 - Fix an issue in the find panel fields that carriage retturns (CR) were not drawn as line endings but conrol characters.
 - Fix an issue under macOS 10.14 that the text in the About panel was black even in the Dark Mode.
 

CotEditor/Sources/NSTextView+Layout.swift

@@ -129,7 +129,8 @@ extension NSTextView {
             }
             
             // reset minimum size for unwrap mode
-            self.minSize = self.visibleRect.size
+            let visibleRect = self.enclosingScrollView?.documentVisibleRect ?? self.visibleRect
+            self.minSize = visibleRect.size
             
             // update view size
             // -> For in the case by scaling-down when the view becomes bigger than text content width