Implement detach point access with SCI_SETUNDODETACH and SCI_GETUNDODETACH.

Write more documentation for undo history.

4 files changed, 37 insertions, 25 deletions

diff --git a/include/Scintilla.h b/include/Scintilla.h
index be537abad..4ea264d8e 100644
--- a/include/Scintilla.h
+++ b/include/Scintilla.h
@@ -342,15 +342,17 @@ typedef sptr_t (*SciFnDirectStatus)(sptr_t ptr, unsigned int iMessage, uptr_t wP
 #define SCI_GETUNDOACTIONS 2790
 #define SCI_SETUNDOSAVEPOINT 2791
 #define SCI_GETUNDOSAVEPOINT 2792
-#define SCI_SETUNDOCURRENT 2793
-#define SCI_GETUNDOCURRENT 2794
+#define SCI_SETUNDODETACH 2793
+#define SCI_GETUNDODETACH 2794
 #define SCI_SETUNDOTENTATIVE 2795
 #define SCI_GETUNDOTENTATIVE 2796
-#define SCI_PUSHUNDOACTIONTYPE 2797
-#define SCI_CHANGELASTUNDOACTIONTEXT 2798
-#define SCI_GETUNDOACTIONTYPE 2799
-#define SCI_GETUNDOACTIONPOSITION 2800
-#define SCI_GETUNDOACTIONTEXT 2801
+#define SCI_SETUNDOCURRENT 2797
+#define SCI_GETUNDOCURRENT 2798
+#define SCI_PUSHUNDOACTIONTYPE 2800
+#define SCI_CHANGELASTUNDOACTIONTEXT 2801
+#define SCI_GETUNDOACTIONTYPE 2802
+#define SCI_GETUNDOACTIONPOSITION 2803
+#define SCI_GETUNDOACTIONTEXT 2804
 #define INDIC_PLAIN 0
 #define INDIC_SQUIGGLE 1
 #define INDIC_TT 2
diff --git a/include/Scintilla.iface b/include/Scintilla.iface
index dd7495a6f..9f5b5a054 100644
--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -842,11 +842,11 @@ set void SetUndoSavePoint=2791(int action,)
 # Which action is the save point?
 get int GetUndoSavePoint=2792(,)
 
-# Set action as the current point
-set void SetUndoCurrent=2793(int action,)
+# Set action as the detach point
+set void SetUndoDetach=2793(int action,)
 
-# Which action is the current point?
-get int GetUndoCurrent=2794(,)
+# Which action is the detach point?
+get int GetUndoDetach=2794(,)
 
 # Set action as the tentative point
 set void SetUndoTentative=2795(int action,)
@@ -854,20 +854,26 @@ set void SetUndoTentative=2795(int action,)
 # Which action is the tentative point?
 get int GetUndoTentative=2796(,)
 
+# Set action as the current point
+set void SetUndoCurrent=2797(int action,)
+
+# Which action is the current point?
+get int GetUndoCurrent=2798(,)
+
 # Push one action onto undo history with no text
-fun void PushUndoActionType=2797(int type, position pos)
+fun void PushUndoActionType=2800(int type, position pos)
 
 # Set the text and length of the most recently pushed action
-fun void ChangeLastUndoActionText=2798(position length, string text)
+fun void ChangeLastUndoActionText=2801(position length, string text)
 
 # What is the type of an action?
-get int GetUndoActionType=2799(int action,)
+get int GetUndoActionType=2802(int action,)
 
 # What is the position of an action?
-get position GetUndoActionPosition=2800(int action,)
+get position GetUndoActionPosition=2803(int action,)
 
 # What is the text of an action?
-get int GetUndoActionText=2801(int action, stringresult text)
+get int GetUndoActionText=2804(int action, stringresult text)
 
 # Indicator style enumeration and some constants
 enu IndicatorStyle=INDIC_
diff --git a/include/ScintillaCall.h b/include/ScintillaCall.h
index 47122fcfe..2f2e4f0cb 100644
--- a/include/ScintillaCall.h
+++ b/include/ScintillaCall.h
@@ -248,10 +248,12 @@ public:
 	int UndoActions();
 	void SetUndoSavePoint(int action);
 	int UndoSavePoint();
-	void SetUndoCurrent(int action);
-	int UndoCurrent();
+	void SetUndoDetach(int action);
+	int UndoDetach();
 	void SetUndoTentative(int action);
 	int UndoTentative();
+	void SetUndoCurrent(int action);
+	int UndoCurrent();
 	void PushUndoActionType(int type, Position pos);
 	void ChangeLastUndoActionText(Position length, const char *text);
 	int UndoActionType(int action);
diff --git a/include/ScintillaMessages.h b/include/ScintillaMessages.h
index 5cff5ed26..a00ed44b4 100644
--- a/include/ScintillaMessages.h
+++ b/include/ScintillaMessages.h
@@ -174,15 +174,17 @@ enum class Message {
 	GetUndoActions = 2790,
 	SetUndoSavePoint = 2791,
 	GetUndoSavePoint = 2792,
-	SetUndoCurrent = 2793,
-	GetUndoCurrent = 2794,
+	SetUndoDetach = 2793,
+	GetUndoDetach = 2794,
 	SetUndoTentative = 2795,
 	GetUndoTentative = 2796,
-	PushUndoActionType = 2797,
-	ChangeLastUndoActionText = 2798,
-	GetUndoActionType = 2799,
-	GetUndoActionPosition = 2800,
-	GetUndoActionText = 2801,
+	SetUndoCurrent = 2797,
+	GetUndoCurrent = 2798,
+	PushUndoActionType = 2800,
+	ChangeLastUndoActionText = 2801,
+	GetUndoActionType = 2802,
+	GetUndoActionPosition = 2803,
+	GetUndoActionText = 2804,
 	IndicSetStyle = 2080,
 	IndicGetStyle = 2081,
 	IndicSetFore = 2082,