commit bb5470b5d1ec1b2f7394164686d6035a0c4bce0f
Author: Guillaume Munch <[email protected]>
Date:   Sun Dec 20 20:56:34 2015 +0000

    Fix the display of column spacing in AMS environments
    
    AMS align environment should have some spacing between odd and even columns.
    
    Add a new virtual method displayColSpace() to InsetMathGrid, InsetMathHull 
and
    InsetMathSplit.

diff --git a/src/mathed/InsetMathGrid.cpp b/src/mathed/InsetMathGrid.cpp
index 00d9a6f..d8e5925 100644
--- a/src/mathed/InsetMathGrid.cpp
+++ b/src/mathed/InsetMathGrid.cpp
@@ -486,7 +486,7 @@ void InsetMathGrid::metrics(MetricsInfo & mi, Dimension & 
dim) const
                colinfo_[col].offset_ =
                        colinfo_[col - 1].offset_ +
                        colinfo_[col - 1].width_ +
-                       colinfo_[col - 1].skip_ +
+                       displayColSpace(col - 1) +
                        colsep() +
                        colinfo_[col].lines_ * vlinesep();
        }
@@ -508,7 +508,7 @@ void InsetMathGrid::metrics(MetricsInfo & mi, Dimension & 
dim) const
                        int const nextoffset =
                                colinfo_[first].offset_ +
                                wid +
-                               colinfo_[last].skip_ +
+                               displayColSpace(last) +
                                colsep() +
                                colinfo_[last+1].lines_ * vlinesep();
                        int const dx = nextoffset - colinfo_[last+1].offset_;
@@ -741,7 +741,7 @@ void InsetMathGrid::metricsT(TextMetricsInfo const & mi, 
Dimension & dim) const
                colinfo_[col].offset_ =
                        colinfo_[col - 1].offset_ +
                        colinfo_[col - 1].width_ +
-                       colinfo_[col - 1].skip_ +
+                       displayColSpace(col - 1) +
                        1 ; //colsep() +
                        //colinfo_[col].lines_ * vlinesep();
        }
@@ -953,7 +953,7 @@ int InsetMathGrid::cellWidth(idx_type idx) const
                col_type c2 = c1 + ncellcols(idx);
                return colinfo_[c2].offset_
                        - colinfo_[c1].offset_
-                       - colinfo_[c2].skip_
+                       - displayColSpace(c2)
                        - colsep()
                        - colinfo_[c2].lines_ * vlinesep();
        }
@@ -1378,6 +1378,11 @@ char InsetMathGrid::displayColAlign(idx_type idx) const
 }
 
 
+int InsetMathGrid::displayColSpace(col_type col) const
+{
+       return colinfo_[col].skip_;
+}
+
 void InsetMathGrid::doDispatch(Cursor & cur, FuncRequest & cmd)
 {
        //lyxerr << "*** InsetMathGrid: request: " << cmd << endl;
@@ -1862,5 +1867,32 @@ char InsetMathGrid::colAlign(HullType type, col_type col)
 }
 
 
+//static
+int InsetMathGrid::colSpace(HullType type, col_type col)
+{
+       int alignInterSpace;
+       switch (type) {
+       case hullEqnArray:
+               return 5;
+       
+       case hullAlign:
+               alignInterSpace = 20;
+               break;
+       case hullAlignAt:
+               alignInterSpace = 0;
+               break;
+       case hullXAlignAt:
+               alignInterSpace = 40;
+               break;
+       case hullXXAlignAt:
+       case hullFlAlign:
+               alignInterSpace = 60;
+               break;
+       default:
+               return 0;
+       }
+       return (col % 2) ? alignInterSpace : 0;
+}
+
 
 } // namespace lyx
diff --git a/src/mathed/InsetMathGrid.h b/src/mathed/InsetMathGrid.h
index 6199b7d..e994310 100644
--- a/src/mathed/InsetMathGrid.h
+++ b/src/mathed/InsetMathGrid.h
@@ -261,8 +261,16 @@ protected:
        /// Column alignment for display of cell \p idx.
        /// Must not be written to file!
        virtual char displayColAlign(idx_type idx) const;
+       /// Column spacing for display of column \p col.
+       /// Must not be written to file!
+       virtual int displayColSpace(col_type col) const;
+
+       // The following two functions are used in InsetMathHull and
+       // InsetMathSplit.
        /// The value of a fixed col align for a certain hull type 
        static char colAlign(HullType type, col_type col);
+       /// The value of a fixed col spacing for a certain hull type
+       static int colSpace(HullType type, col_type col);
 
        /// row info.
        /// rowinfo_[nrows()] is a dummy row used only for hlines.
diff --git a/src/mathed/InsetMathHull.cpp b/src/mathed/InsetMathHull.cpp
index cce029f..b6cf474 100644
--- a/src/mathed/InsetMathHull.cpp
+++ b/src/mathed/InsetMathHull.cpp
@@ -382,6 +382,13 @@ char InsetMathHull::displayColAlign(idx_type idx) const
 }
 
 
+int InsetMathHull::displayColSpace(col_type col) const
+{
+       return colSpace(type_, col);
+}
+
+
+//FIXME: This has probably no effect and can be removed.
 int InsetMathHull::defaultColSpace(col_type col)
 {
        if (type_ == hullAlign || type_ == hullAlignAt)
diff --git a/src/mathed/InsetMathHull.h b/src/mathed/InsetMathHull.h
index 9598ad4..084fff6 100644
--- a/src/mathed/InsetMathHull.h
+++ b/src/mathed/InsetMathHull.h
@@ -111,6 +111,8 @@ public:
        ///
        int defaultColSpace(col_type col);
        ///
+       int displayColSpace(col_type col) const;
+       ///
        char defaultColAlign(col_type col);
        ///
        char displayColAlign(idx_type idx) const;
diff --git a/src/mathed/InsetMathSplit.cpp b/src/mathed/InsetMathSplit.cpp
index f85e664..07e78f4 100644
--- a/src/mathed/InsetMathSplit.cpp
+++ b/src/mathed/InsetMathSplit.cpp
@@ -83,6 +83,17 @@ char InsetMathSplit::displayColAlign(idx_type idx) const
 }
 
 
+int InsetMathSplit::displayColSpace(col_type col) const
+{
+       if (name_ == "split" || name_ == "aligned" || name_ == "align")
+               return colSpace(hullAlign, col);
+       if (name_ == "alignedat")
+               return colSpace(hullAlignAt, col);
+       return 0;
+}
+
+
+
 void InsetMathSplit::draw(PainterInfo & pi, int x, int y) const
 {
        InsetMathGrid::draw(pi, x, y);
diff --git a/src/mathed/InsetMathSplit.h b/src/mathed/InsetMathSplit.h
index 6136b6f..0f47e38 100644
--- a/src/mathed/InsetMathSplit.h
+++ b/src/mathed/InsetMathSplit.h
@@ -41,6 +41,8 @@ public:
        ///
        int defaultColSpace(col_type) { return 0; }
        ///
+       int displayColSpace(col_type col) const;
+       ///
        char defaultColAlign(col_type);
        ///
        char displayColAlign(idx_type idx) const;

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