commit 405b5c04a7f86171a6a883cea94600ebb9456cd7
Author: Jean-Marc Lasgouttes <[email protected]>
Date:   Sat Dec 19 15:34:20 2020 +0100

    Fixup 005f69de: code cleanup.
    
    Since we are not sure of where the cursor ends up after invoking
    Cursor::handleNest it is safer to reset the cursor at each cell,
    rather than reuse the same one over and over.
    
    Related to bug #12035.
---
 src/mathed/InsetMathNest.cpp |   21 +++++++++------------
 1 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/src/mathed/InsetMathNest.cpp b/src/mathed/InsetMathNest.cpp
index 3dd55e4..5cce553 100644
--- a/src/mathed/InsetMathNest.cpp
+++ b/src/mathed/InsetMathNest.cpp
@@ -450,8 +450,8 @@ void InsetMathNest::handleNest(Cursor & cur, MathAtom const 
& nest)
 void InsetMathNest::handleNest(Cursor & cur, MathAtom const & nest,
        docstring const & arg)
 {
-       CursorSlice i1 = cur.selBegin();
-       CursorSlice i2 = cur.selEnd();
+       DocIterator const i1 = cur.selectionBegin();
+       DocIterator const i2 = cur.selectionEnd();
        if (!i1.inset().asInsetMath())
                return;
        if (i1.idx() == i2.idx()) {
@@ -462,8 +462,9 @@ void InsetMathNest::handleNest(Cursor & cur, MathAtom const 
& nest,
        }
 
        // multiple selected cells in a simple non-grid inset
-       if (i1.asInsetMath()->nrows() == 0 || i1.asInsetMath()->ncols() == 0) {
+       if (i1.inset().nrows() == 0 || i1.inset().ncols() == 0) {
                for (idx_type i = i1.idx(); i <= i2.idx(); ++i) {
+                       cur.setCursor(i1);
                        // select cell
                        cur.idx() = i;
                        cur.pos() = 0;
@@ -471,14 +472,9 @@ void InsetMathNest::handleNest(Cursor & cur, MathAtom 
const & nest,
                        cur.pos() = cur.lastpos();
                        cur.setSelection();
 
-                       // change font of cell
+                       // do the real job
                        cur.handleNest(nest);
                        cur.insert(arg);
-
-                       // cur is in the font inset now. If the loop continues,
-                       // we need to get outside again for the next cell
-                       if (i + 1 <= i2.idx())
-                               cur.pop_back();
                }
                return;
        }
@@ -486,17 +482,18 @@ void InsetMathNest::handleNest(Cursor & cur, MathAtom 
const & nest,
        // the complicated case with multiple selected cells in a grid
        row_type r1, r2;
        col_type c1, c2;
-       cap::region(i1, i2, r1, r2, c1, c2);
+       cap::region(i1.top(), i2.top(), r1, r2, c1, c2);
        for (row_type row = r1; row <= r2; ++row) {
                for (col_type col = c1; col <= c2; ++col) {
+                       cur.setCursor(i1);
                        // select cell
-                       cur.idx() = i1.asInsetMath()->index(row, col);
+                       cur.idx() = i1.inset().index(row, col);
                        cur.pos() = 0;
                        cur.resetAnchor();
                        cur.pos() = cur.lastpos();
                        cur.setSelection();
 
-                       //
+                       // do the real job
                        cur.handleNest(nest);
                        cur.insert(arg);
                }
-- 
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