Smooth transition for custom keyboards and softkey

Closes #3786
Fixes #3780
// FREEBIE

src/org/thoughtcrime/securesms/util/Util.java

@@ -348,4 +348,8 @@ public class Util {
   public static int clamp(int value, int min, int max) {
     return Math.min(Math.max(value, min), max);
   }
+
+  public static float clamp(float value, float min, float max) {
+    return Math.min(Math.max(value, min), max);
+  }
 }