diff -r f109917f5c28 -r 5da1d162ad50 tests/test-topic-stack.t
--- a/tests/test-topic-stack.t	Wed Mar 06 21:47:08 2019 +0800
+++ b/tests/test-topic-stack.t	Thu Mar 07 19:13:45 2019 +0800
@@ -331,8 +331,8 @@
   $ hg topic --list
   ### topic: foo
   ### target: default (branch)
-  s4$ c_f (unstable)
-  s3$ c_e (unstable)
+  s4$ c_f (orphan)
+  s3$ c_e (orphan)
   s2@ c_d (current)
   s1: c_c
   s0^ c_b (base)
@@ -341,16 +341,16 @@
   $ hg topic --list
   ### topic: foo
   ### target: default (branch)
-  s4$ c_f (unstable)
-  s3$ c_e (current unstable)
+  s4$ c_f (orphan)
+  s3$ c_e (current orphan)
   s2: c_d
   s1: c_c
   s0^ c_b (base)
   $ hg topic --list --color=debug
   [topic.stack.summary.topic|### topic: [topic.active|foo]]
   [topic.stack.summary.branches|### target: default (branch)]
-  [topic.stack.index topic.stack.index.unstable|s4][topic.stack.state topic.stack.state.unstable|$] [topic.stack.desc topic.stack.desc.unstable|c_f][topic.stack.state topic.stack.state.unstable| (unstable)]
-  [topic.stack.index topic.stack.index.current topic.stack.index.unstable|s3][topic.stack.state topic.stack.state.current topic.stack.state.unstable|$] [topic.stack.desc topic.stack.desc.current topic.stack.desc.unstable|c_e][topic.stack.state topic.stack.state.current topic.stack.state.unstable| (current unstable)]
+  [topic.stack.index topic.stack.index.orphan|s4][topic.stack.state topic.stack.state.orphan|$] [topic.stack.desc topic.stack.desc.orphan|c_f][topic.stack.state topic.stack.state.orphan| (orphan)]
+  [topic.stack.index topic.stack.index.current topic.stack.index.orphan|s3][topic.stack.state topic.stack.state.current topic.stack.state.orphan|$] [topic.stack.desc topic.stack.desc.current topic.stack.desc.orphan|c_e][topic.stack.state topic.stack.state.current topic.stack.state.orphan| (current orphan)]
   [topic.stack.index topic.stack.index.clean|s2][topic.stack.state topic.stack.state.clean|:] [topic.stack.desc topic.stack.desc.clean|c_d]
   [topic.stack.index topic.stack.index.clean|s1][topic.stack.state topic.stack.state.clean|:] [topic.stack.desc topic.stack.desc.clean|c_c]
   [topic.stack.index topic.stack.index.base|s0][topic.stack.state topic.stack.state.base|^] [topic.stack.desc topic.stack.desc.base|c_b][topic.stack.state topic.stack.state.base| (base)]
@@ -488,8 +488,8 @@
   s6: c_h
   s5: c_g
   s2^ c_D (base current)
-  s4$ c_f (unstable)
-  s3$ c_e (unstable)
+  s4$ c_f (orphan)
+  s3$ c_e (orphan)
   s2@ c_D (current)
   s1: c_c
   s0^ c_b (base)
@@ -767,24 +767,24 @@
   $ hg stack red
   ### topic: red
   ### target: default (branch), ambiguous rebase destination - topic 'red' has 3 heads
-  s5$ c_H (unstable)
+  s5$ c_H (orphan)
     ^ c_G
     ^ c_D
-  s4$ c_C (unstable)
+  s4$ c_C (orphan)
   s1^ c_B (base)
-  s3$ c_F (unstable)
-  s2$ c_E (unstable)
+  s3$ c_F (orphan)
+  s2$ c_E (orphan)
   s1: c_B
   s0^ c_A (base)
   $ hg stack blue
   ### topic: blue
   ### target: default (branch), ambiguous rebase destination - topic 'blue' has 3 heads
-  s3$ c_I (unstable)
+  s3$ c_I (orphan)
     ^ c_H
-  s2$ c_G (unstable)
+  s2$ c_G (orphan)
     ^ c_F
-  s1$ c_D (current unstable)
-  s0^ c_C (base unstable)
+  s1$ c_D (current orphan)
+  s0^ c_C (base orphan)
 
 more obsolescence
 
@@ -841,24 +841,24 @@
   $ hg stack red
   ### topic: red
   ### target: default (branch), ambiguous rebase destination - topic 'red' has 3 heads
-  s5$ c_H (unstable)
+  s5$ c_H (orphan)
     ^ c_G
     ^ c_D
-  s4$ c_F (unstable)
-  s3$ c_E (unstable)
+  s4$ c_F (orphan)
+  s3$ c_E (orphan)
   s1^ c_B (base)
-  s2$ c_C (unstable)
+  s2$ c_C (orphan)
   s1: c_B
   s0^ c_A (base)
   $ hg stack blue
   ### topic: blue
   ### target: default (branch), ambiguous rebase destination - topic 'blue' has 3 heads
-  s3$ c_I (unstable)
+  s3$ c_I (orphan)
     ^ c_H
-  s2$ c_G (unstable)
+  s2$ c_G (orphan)
     ^ c_F
-  s1$ c_D (current unstable)
-  s0^ c_C (base unstable)
+  s1$ c_D (current orphan)
+  s0^ c_C (base orphan)
 
 Test stack behavior with a split
 --------------------------------
@@ -897,7 +897,7 @@
   $ hg stack
   ### topic: blue
   ### target: default (branch)
-  s3$ c_I (unstable)
+  s3$ c_I (orphan)
   s2@ c_G (current)
   s1: c_D
   s0^ c_A (base)
@@ -977,7 +977,7 @@
   $ hg stack
   ### topic: blue
   ### target: default (branch)
-  s4$ c_I (unstable)
+  s4$ c_I (orphan)
   s3@ c_G (current)
   s2: c_G
   s1: c_D