txs restores wrong top line with folded lines

[octaeder]

Fold 13 lines (i.e. they are hidden) as shown here:

Then scroll down (down is the important information here) to line 253 such that this line is at top of the editor:

Close txs (but not the editor) and find their indices in the session file:

"FirstLine": 252,
"FoldedLines": "227",

Starting txs the editor shows at top line:

But we expect to see line 253 at top.

Txs calculates the position of FirstLine before lines are folded. Since 13 lines are hidden by folding, line 253+13=263 moves to top of the editor. S. QDocument::y(…) used in scrollToFirstLine, which respects folded and wrapped lines by calling visualLine.
To fix this the order of position calculation and folding need to be reversed.

[sunderme]

thanks