Update constraint and test case

Author: fanyu

Mixin/UserInterface/Controllers/Chat/Model/PhotoSizeCalculator.swift

@@ -20,10 +20,10 @@ enum PhotoSizeCalculator {
             if contentRatio > 1 {
                 if contentRatio > Height.max / Width.max {
                     height = Height.max
-                    width = round(height / contentRatio)
+                    width = max(Width.min, round(height / contentRatio))
                 } else {
                     width = Width.max
-                    height = round(width * contentRatio)
+                    height = min(Height.max, round(width * contentRatio))
                 }
             } else {
                 width = Width.max

MixinTests/PhotoDisplayTests.swift

@@ -36,20 +36,20 @@ class PhotoDisplayTests: XCTestCase {
         let expected = [
             // Bad input
             CGSize(width: 120, height: 120),
-            
+
             // General photos
             CGSize(width: 210, height: 280),
             CGSize(width: 210, height: 158),
 
             // Panoramas
             CGSize(width: 210, height: 120),
-            CGSize(width: 97, height: 280),
+            CGSize(width: 120, height: 280),
 
             // Article
-            CGSize(width: 8, height: 280),
+            CGSize(width: 120, height: 280),
 
             // Irregular shapes
-            CGSize(width: 112, height: 280),
+            CGSize(width: 120, height: 280),
             CGSize(width: 120, height: 280),
             CGSize(width: 120, height: 280),