Mostly fixed the 'empty paragraph deletion kills the cursor' problem; and initialise a few more vars in tabulars

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@3347 a592a061-630c-0410-9148-cb99ea01b6c8

src/BufferView2.C

@@ -110,17 +110,44 @@ bool BufferView::removeAutoInsets()
 {
 	LyXCursor tmpcursor = text->cursor;
 	Paragraph * cur_par = tmpcursor.par();
+	Paragraph * cur_par_prev = cur_par ? cur_par->previous() : 0;
+	Paragraph * cur_par_next = cur_par ? cur_par->next() : 0;
 	pos_type cur_pos = tmpcursor.pos();
 
 	bool found = false;
 
+	// Trap the deletion of the paragraph the cursor is in.
+	// It should be almost impossible for the new cursor par to be
+	// deleted later on in this function.
+	// This is the way to segfault this now. Although you may have to do this
+	// multiple times: Have an InsetERT with an unknown command in it.
+	// View->DVI, move cursor between Error box and InsetERT and hit <Enter>,
+	// <down-arrow>, <Enter> again, View->DVI, BANG!
+	//
+	while ((cur_par_prev || cur_par_next)
+	       && text->setCursor(this,
+				  cur_par_prev ? cur_par_prev : cur_par_next,
+				  0)) {
+		// we just removed cur_par so have to fix the "cursor"
+		if (cur_par_prev) {
+			cur_par = cur_par_prev;
+			cur_pos = cur_par->size();
+		} else {
+			cur_par = cur_par_next;
+			cur_pos = 0;
+		}
+		cur_par_prev = cur_par->previous();
+		cur_par_next = cur_par->next();
+	}
+
 	ParIterator it = buffer()->par_iterator_begin();
 	ParIterator end = buffer()->par_iterator_end();
 	for (; it != end; ++it) {
 		Paragraph * par = *it;
+		Paragraph * par_prev = par ? par->previous() : 0;
 		bool removed = false;
 
-		text->setCursor(this, par, 0);
+		bool dead = text->setCursor(this, par, 0);
 
 		Paragraph::inset_iterator pit = par->inset_iterator_begin();
 		Paragraph::inset_iterator pend = par->inset_iterator_end();
@@ -142,6 +169,40 @@ bool BufferView::removeAutoInsets()
 			found = true;
 			text->redoParagraph(this);
 		}
+		if (dead) {
+			// Error box paragraphs appear to have a bad next_ pointer
+			// especially when that's all that's in the paragraph..
+			// Then if you are in an empty paragraph after an error box
+			// which is in its own paragraph this will fail because
+			// cur_prev_par was the one just deleted (I think).
+			// That's the main reason why this clause makes almost no difference.
+			// Feel free to delete this whole clause as my brain is asleep now.
+			while ((cur_par_prev || cur_par_next)
+			       && text->setCursor(this,
+						  cur_par_prev ? cur_par_prev : cur_par_next,
+						  0)) {
+				// we just removed cur_par so have to fix the "cursor"
+				if (cur_par_prev == par) {
+					// attempting to solve the "prev par was deleted
+					// because it had only an error inset in it" problem
+					if (par_prev) {
+						cur_par = par_prev;
+						cur_pos = cur_par->size();
+					} else {
+						cur_par = cur_par_next;
+						cur_pos = 0;
+					}
+				} else if (cur_par_prev) {
+					cur_par = cur_par_prev;
+					cur_pos = cur_par->size();
+				} else {
+					cur_par = cur_par_next;
+					cur_pos = 0;
+				}
+				cur_par_prev = cur_par->previous();
+				cur_par_next = cur_par->next();
+			}
+		}
 	}
 
 	text->setCursorIntern(this, cur_par, cur_pos);

src/ChangeLog

@@ -1,3 +1,18 @@
+2002-01-13  Allan Rae  <rae@lyx.org>
+
+	* BufferView2.C (removeAutoInsets): ensure we have a valid cursor if
+	the old cursor is now invalid due to deleteEmptyParagraphMechanism.
+	There is still a way to segfault this although you may have to do this
+	multiple times: Have an InsetERT with an unknown command in it. 
+	View->DVI, move cursor between Error box and InsetERT and hit <Enter>,
+	<down-arrow>, <Enter> again, View->DVI, BANG!
+
+	* text2.C (setCursor): 
+	(deleteEmptyParagraphMechanism): 
+	* lyxtext.h (setCursor): 
+	(deleteEmptyParagraphMechanism): return true if the paragraph was deleted.
+	Making use of the return value may help fix other bugs.
+
 2002-01-12  Jean-Marc Lasgouttes  <lasgouttes@freesurf.fr>
 
 	* LyXAction.[Ch]: move isPseudoAction to the C file, since nobody

src/insets/ChangeLog

@@ -1,3 +1,8 @@
+2002-01-13  Allan Rae  <rae@lyx.org>
+
+	* insettabular.C (InsetTabular): Both constructors now initialise
+	all class variables.
+
 2002-01-11  Juergen Vigna  <jug@sad.it>
 
 	* insettext.C (insetButtonPress): set the_locking_inset to 0.

src/insets/insettabular.C

@@ -138,6 +138,7 @@ InsetTabular::InsetTabular(Buffer const & buf, int rows, int columns)
 	// for now make it always display as display() inset
 	// just for test!!!
 	the_locking_inset = 0;
+	old_locking_inset = 0;
 	locked = false;
 	oldcell = -1;
 	actrow = actcell = 0;
@@ -145,6 +146,8 @@ InsetTabular::InsetTabular(Buffer const & buf, int rows, int columns)
 	need_update = INIT;
 	in_update = false;
 	in_reset_pos = false;
+	inset_x = 0;
+	inset_y = 0;
 }
 
 
@@ -154,6 +157,7 @@ InsetTabular::InsetTabular(InsetTabular const & tab, Buffer const & buf,
 {
 	tabular.reset(new LyXTabular(this, *(tab.tabular), same_id));
 	the_locking_inset = 0;
+	old_locking_inset = 0;
 	locked = false;
 	oldcell = -1;
 	actrow = actcell = 0;
@@ -161,6 +165,8 @@ InsetTabular::InsetTabular(InsetTabular const & tab, Buffer const & buf,
 	need_update = INIT;
 	in_update = false;
 	in_reset_pos = false;
+	inset_x = 0;
+	inset_y = 0;
 }
 
 

src/lyxtext.h

@@ -306,8 +306,8 @@ public:
 	string const selectNextWordToSpellcheck(BufferView *, float & value) const;
 	///
 	void selectSelectedWord(BufferView *);
-	///
+	/// returns true if par was empty and was removed
-	void setCursor(BufferView *, Paragraph * par,
+	bool setCursor(BufferView *, Paragraph * par,
 		       lyx::pos_type pos,
 		       bool setfont = true,
 		       bool boundary = false) const;
@@ -612,8 +612,8 @@ private:
 				  LyXCursor & cur,
 				  LyXCursor const & where) const;
 	
-	/// delete double space or empty paragraphs around old_cursor 
+	/// delete double space (false) or empty paragraphs (true) around old_cursor 
-	void deleteEmptyParagraphMechanism(BufferView *,
+	bool deleteEmptyParagraphMechanism(BufferView *,
 					   LyXCursor const & old_cursor) const;
 
 public:

src/text2.C

@@ -2090,13 +2090,13 @@ bool LyXText::updateInset(BufferView * bview, Inset * inset)
 }
 
 
-void LyXText::setCursor(BufferView * bview, Paragraph * par,
+bool LyXText::setCursor(BufferView * bview, Paragraph * par,
                         pos_type pos, 
                         bool setfont, bool boundary) const
 {
 	LyXCursor old_cursor = cursor;
 	setCursorIntern(bview, par, pos, setfont, boundary);
-	deleteEmptyParagraphMechanism(bview, old_cursor);
+	return deleteEmptyParagraphMechanism(bview, old_cursor);
 }
 
 
@@ -2373,22 +2373,20 @@ void LyXText::fixCursorAfterDelete(BufferView * bview,
 }
 
 
-void LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
+bool LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
 					    LyXCursor const & old_cursor) const
 {
 	// Would be wrong to delete anything if we have a selection.
-	if (selection.set()) return;
+	if (selection.set()) return false;
 
 	// We allow all kinds of "mumbo-jumbo" when freespacing.
 	if (textclasslist.Style(bview->buffer()->params.textclass,
 				old_cursor.par()->getLayout()).free_spacing
 	    || old_cursor.par()->isFreeSpacing())
 	{
-		return;
+		return false;
 	}
 	
-	bool deleted = false;
-	
 	/* Ok I'll put some comments here about what is missing.
 	   I have fixed BackSpace (and thus Delete) to not delete
 	   double-spaces automagically. I have also changed Cut,
@@ -2442,22 +2440,26 @@ void LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
 			fixCursorAfterDelete(bview, toggle_cursor, old_cursor);
 			fixCursorAfterDelete(bview, toggle_end_cursor,
 					     old_cursor);
-			return;
+			return false;
 		}
 	}
 
 	// don't delete anything if this is the ONLY paragraph!
 	if (!old_cursor.par()->next() && !old_cursor.par()->previous())
-		return;
+		return false;
 	
 	// Do not delete empty paragraphs with keepempty set.
 	if ((textclasslist.Style(bview->buffer()->params.textclass,
 				 old_cursor.par()->getLayout())).keepempty)
-		return;
+		return false;
 
 	// only do our magic if we changed paragraph
 	if (old_cursor.par() == cursor.par()) 
-		return;
+		return false;
+	
+	// record if we have deleted a paragraph
+	// we can't possibly have deleted a paragraph before this point
+	bool deleted = false;
 
 	if ((old_cursor.par()->size() == 0
 	     || (old_cursor.par()->size() == 1
@@ -2488,7 +2490,7 @@ void LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
 			if (ownerParagraph() == old_cursor.par()) {
 				ownerParagraph(ownerParagraph()->next());
 			}
-				// delete old par
+			// delete old par
 			delete old_cursor.par();
 					
 			/* Breakagain the next par. Needed because of
@@ -2538,7 +2540,7 @@ void LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
 		setCursorIntern(bview, cursor.par(), cursor.pos());
 
 		if (selection.cursor.par()  == old_cursor.par()
-		    && selection.cursor.pos() == selection.cursor.pos()) {
+		    && selection.cursor.pos() == old_cursor.pos()) {
 			// correct selection
 			selection.cursor = cursor;
 		}
@@ -2552,6 +2554,7 @@ void LyXText::deleteEmptyParagraphMechanism(BufferView * bview,
 			selection.cursor = cursor;
 		}
 	}
+	return deleted;
 }