What version control software allowing overlaying branches similar to Perforce views?
An overlay mapping is used to map files from more than one depot directory into the same place in the workspace.
For example each branch has several fixes and need to be brought together into the Project/Source directory.
Perforce example:
//depot/Project/Source/... //workspace/Project/Source/...
+//depot/branch1/Source/... //workspace/Project/Source/...
+//depot/branch2/Source/... //workspace/Project/Source/...
+//depot/branch3/Source/file.java //workspace/Project/Source/file.java
branch3/Source/file.java
would be change not theProject/Source/file.java