* src/frontends/controllers/Dialog.{cpp,h}:

- new boolean canApplyToReadonly that allows to apply params/update view
	  even if the buffer is readOnly for specific dialogs.

* src/frontends/controllers/ControlPrint.h: 
	- use that (fix bug 3909)
* src/frontends/controllers/ControlViewSource: 
	- dto. (fix bug 3943)

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18959 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/controllers/ControlPrint.h

@@ -40,6 +40,8 @@ public:
 	///
 	virtual bool isBufferDependent() const { return true; }
 	///
+	virtual bool canApplyToReadOnly() const { return true; }
+	///
 	virtual kb_action getLfun() const { return LFUN_BUFFER_PRINT; }
 
 	/// Browse for a file

src/frontends/controllers/ControlViewSource.h

@@ -37,6 +37,8 @@ public:
 	virtual bool isBufferDependent() const { return true; }
 	///
 	bool canApply() const { return true; }
+	///
+	virtual bool canApplyToReadOnly() const { return true; }
 
 	/// The title displayed by the dialog reflects source type.
 	docstring const title() const;

src/frontends/controllers/Dialog.cpp

@@ -121,7 +121,8 @@ void Dialog::apply()
 {
 	if (controller().isBufferDependent()) {
 		if (!kernel().isBufferAvailable() ||
-		    kernel().isBufferReadonly())
+		    (kernel().isBufferReadonly() &&
+		     !controller().canApplyToReadOnly()))
 			return;
 	}
 
@@ -188,7 +189,7 @@ void Dialog::checkStatus()
 		bc().readOnly(readonly);
 		// refreshReadOnly() is too generous in _enabling_ widgets
 		// update dialog to disable disabled widgets again
-		if (!readonly)
+		if (!readonly || controller().canApplyToReadOnly())
 			view().update();
 	} else
 		bc().readOnly(true);

src/frontends/controllers/Dialog.h

@@ -161,6 +161,12 @@ public:
 	 */
 	virtual bool isBufferDependent() const = 0;
 
+	/** \return true if the dialog can apply data also
+	 *  for ReadOnly buffers.
+	 *  This has to be distinguished from isBufferDependent()
+	 */
+	virtual bool canApplyToReadOnly() const { return false; }
+
 	/** The lfun that is sent for applying the data.
 	 *
 	 * This method is used by the default implementation of canApply()