-- tolower takes chars and returns chars, types are int because C only deals with ints
-- format parameter is size_t but there is no std parsing function that returns size_t. stoull is used instead as the widest alternative, and then the cast is applied to suppress the conversion warnings
-- to encode: copy the string into unicodelookup.com. Take the hex representation and pad to 4 characters with '0's, prefixing each character with '\u'
-- sqref is a block of selected cells containing the active_cell (normally is just == active_cell)
-- active cell is the selected vell in this selection/view/pane
-- inactive selections use the top-left cell as the active_cell
-- NOTE: It doesn't seem likely that these should be 'A1' in all cases (set to 'A1' because current tests demanded it). Purpose of this parameter needs clarification
-- NOTE: [xlnt::selection] needs appropriate ctor's once the purpose of the parameters can be clarified
-- additional tests to cover both variants of the set function
-- additional tests to cover hyper links on cells with non-string data
-- modified hyper link set function to handle cells with non-string data
-- fixed test behaviour for a cell with no value (value is set to the string form of the link. Behaviour copied from Excel 2010)
-- Resolves two test failures caused by a crash when setting the title to the existing value removing the sheet from the 'sheet_title_rel_id_map_'
-- added empty title check
There was a bug introduced in version 1.2 in reading styles. As from the Office Open XML documentation:
Every cell will have a reference to one <xf> in the <cellXfs> collection. This is direct formatting for the cell. To apply a style to the cell, the <xf> references the style using the xfId attribute. The xfId attribute is an index into the <cellStyleXFs> collection, which collects the cell styles available to the user. The <cellStyleXFs> contains one <xf> for each style. Each such <xf> is tied to its name via an index (in its xfId attribute) from the <cellStyles> collection.
Existing implementation simply tried to fetch a style name by using index in the styles vector causing an index_out_of_range exception for each xfId that was ot of bounds of cellStyles collection. What was needed is to match the xfId attribute of the cellStyle element.
