Get rid of use_preview_ in various insets

This concerns InsetPreview, InsetIPA and InsetMathHull.

Caching such a value is bad when opening the same buffer in two views.
In this case, it is not necessary to remember use_preview_ at all,
actually.

Also remove private member dim_ which is not used and remove some trailing whitespace.

Fixes bugs #9085 abd #9957.

src/insets/InsetIPA.cpp

@@ -37,7 +37,7 @@ namespace lyx {
 
 InsetIPA::InsetIPA(Buffer * buf) 
 	: InsetText(buf),
-	  preview_(new RenderPreview(this)), use_preview_(true)
+	  preview_(new RenderPreview(this))
 {
 	setAutoBreakRows(true);
 	setDrawFrame(true);
@@ -141,9 +141,7 @@ void InsetIPA::reloadPreview(DocIterator const & pos) const
 
 void InsetIPA::draw(PainterInfo & pi, int x, int y) const
 {
-	use_preview_ = previewState(pi.base.bv);
+	if (previewState(pi.base.bv)) {
-
-	if (use_preview_) {
 		preview_->draw(pi, x + TEXT_TO_INSET_OFFSET, y);
 		setPosCache(pi, x, y);
 		return;
@@ -161,7 +159,7 @@ void InsetIPA::edit(Cursor & cur, bool front, EntryDirection entry_from)
 
 Inset * InsetIPA::editXY(Cursor & cur, int x, int y)
 {
-	if (use_preview_) {
+	if (previewState(&cur.bv())) {
 		edit(cur, true, ENTRY_DIRECTION_IGNORE);
 		return this;
 	}
@@ -182,7 +180,6 @@ void InsetIPA::metrics(MetricsInfo & mi, Dimension & dim) const
 		dim.asc += TEXT_TO_INSET_OFFSET;
 		dim.des += TEXT_TO_INSET_OFFSET;
 		dim.wid += TEXT_TO_INSET_OFFSET;
-		dim_ = dim;
 		dim.wid += TEXT_TO_INSET_OFFSET;
 		// insert a one pixel gap
 		dim.wid += 1;

src/insets/InsetIPA.h

@@ -90,12 +90,6 @@ protected:
 
 	///
 	boost::scoped_ptr<RenderPreview> preview_;
-	///
-	mutable bool use_preview_;
-
-private:
-	///
-	mutable Dimension dim_;
 };
 
 

src/insets/InsetPreview.cpp

@@ -36,8 +36,7 @@ namespace lyx {
 
 
 InsetPreview::InsetPreview(Buffer * buf)
-	: InsetText(buf),
+	: InsetText(buf), preview_(new RenderPreview(this))
-	  preview_(new RenderPreview(this)), use_preview_(true)
 {
 	setAutoBreakRows(true);
 	setDrawFrame(true);
@@ -128,14 +127,11 @@ void InsetPreview::reloadPreview(DocIterator const & pos) const
 
 void InsetPreview::draw(PainterInfo & pi, int x, int y) const
 {
-	use_preview_ = previewState(pi.base.bv);
+	if (previewState(pi.base.bv)) {
-
-	if (use_preview_) {
 		// one pixel gap in front
 		preview_->draw(pi, x + 1 + TEXT_TO_INSET_OFFSET, y);
 		setPosCache(pi, x, y);
-		return;
+	} else
-	}
 		InsetText::draw(pi, x, y);
 }
 
@@ -149,7 +145,7 @@ void InsetPreview::edit(Cursor & cur, bool front, EntryDirection entry_from)
 
 Inset * InsetPreview::editXY(Cursor & cur, int x, int y)
 {
-	if (use_preview_) {
+	if (previewState(&cur.bv())) {
 		edit(cur, true, ENTRY_DIRECTION_IGNORE);
 		return this;
 	}
@@ -170,7 +166,6 @@ void InsetPreview::metrics(MetricsInfo & mi, Dimension & dim) const
 		dim.asc += TEXT_TO_INSET_OFFSET;
 		dim.des += TEXT_TO_INSET_OFFSET;
 		dim.wid += TEXT_TO_INSET_OFFSET;
-		dim_ = dim;
 		dim.wid += TEXT_TO_INSET_OFFSET;
 		// insert a one pixel gap
 		dim.wid += 1;

src/insets/InsetPreview.h

@@ -79,12 +79,7 @@ protected:
 
 	///
 	boost::scoped_ptr<RenderPreview> preview_;
-	///
-	mutable bool use_preview_;
 
-private:
-	///
-	mutable Dimension dim_;
 };
 
 

src/mathed/InsetMathHull.cpp

@@ -315,7 +315,7 @@ void InsetMathHull::addToToc(DocIterator const & pit, bool output_active) const
 
 Inset * InsetMathHull::editXY(Cursor & cur, int x, int y)
 {
-	if (use_preview_) {
+	if (previewState(&cur.bv())) {
 		edit(cur, true);
 		return this;
 	}
@@ -524,7 +524,6 @@ void InsetMathHull::drawBackground(PainterInfo & pi, int x, int y) const
 void InsetMathHull::draw(PainterInfo & pi, int x, int y) const
 {
 	BufferView const * const bv = pi.base.bv;
-	use_preview_ = previewState(bv);
 
 	if (type_ == hullRegexp) {
 		Dimension const dim = dimension(*bv);
@@ -532,7 +531,7 @@ void InsetMathHull::draw(PainterInfo & pi, int x, int y) const
 			dim.width() - 2, dim.height() - 2, Color_regexpframe);
 	}
 
-	if (use_preview_) {
+	if (previewState(bv)) {
 		Dimension const dim = dimension(*bv);
 		if (previewTooSmall(dim)) {
 			// we have an extra frame

src/mathed/InsetMathHull.h

@@ -243,8 +243,6 @@ private:
 	///
 	boost::scoped_ptr<RenderPreview> preview_;
 	///
-	mutable bool use_preview_;
-	///
 	DocIterator docit_;
 	///
 	typedef std::map<docstring, int> CounterMap;

status.21x

@@ -98,6 +98,9 @@ What's new
 
 - Fix automatic insertion of longtable captions (bug 9692).
 
+- Fix crash with preived math shown in two views of the same document
+  (bug 9957).
+
 - Fix setting of nested minipage via the dialog (bug 8716).
 
 - Reset cursor language when changing document-wide language (bug 9586).