Layout fix in searchable actions

Summary: Tiny fix were horizontally aligned items were accidentally allowed to shrink by default.

Reviewed By: cekkaewnumchai

Differential Revision: D24501856

fbshipit-source-id: 30ad3987a744b14b41993ed27db9edadd420f0df

desktop/app/src/ui/components/Layout.tsx

@@ -53,7 +53,14 @@ const Container = styled.div<ContainerProps>(
   }) => ({
     display: 'flex',
     flexDirection: 'column',
-    flex: grow && shrink ? `1 1 0` : grow ? `1 0 auto` : shrink ? `0 1 0` : 0,
+    flex:
+      grow && shrink
+        ? `1 1 0` // allow growing, and shrinking smaller than actual size
+        : grow
+        ? `1 0 auto` // allow grow, start at natural size
+        : shrink
+        ? `0 1 0` // allow shrinking smaller than natural size
+        : `0 0 auto`, // (default) use natural size, don't grow or shrink (in parent flex direction)
     minWidth: shrink ? 0 : undefined,
     boxSizing: 'border-box',
     width,