better change detection for tsliders in matrixview

Author: jcupitt

src/classmodel.c

@@ -1230,10 +1230,9 @@ classmodel_update(Classmodel *classmodel)
 void
 classmodel_update_view(Classmodel *classmodel)
 {
-	Row *row = HEAPMODEL(classmodel)->row;
-
 	classmodel_update(classmodel);
 
+	Row *row = HEAPMODEL(classmodel)->row;
 	if (row &&
 		row->expr)
 		workspace_set_modified(row->ws, TRUE);

src/matrixview.c

@@ -100,9 +100,9 @@ matrixview_slider_changed(Tslider *tslider, Matrixview *matrixview)
 
 	g_assert(pos >= 0);
 
-	/* Install value.
+	/* Install value. Ignore changes due to rounding.
 	 */
-	if (matrix->value.coeff[i] != tslider->svalue) {
+	if (fabs(matrix->value.coeff[i] - tslider->svalue) > 0.0001) {
 		matrix->value.coeff[i] = tslider->svalue;
 
 		classmodel_update_view(CLASSMODEL(matrix));