Make selection work across ligatures

For widgets like QPlainTextEdit, selection across ligatures (typically
'fi', 'ffi', 'fl', etc.) end up highlighting the entire ligature
glyphs, this patch fixed that by dividing width inside the ligature so
that selection will not expand past the actual selected characters.
Since cursor position already considered this, we merely adopted the
algorithm and made it a separated helper function for all necessary
cases. Dividing width directly looks like a temporary workaround but
works well enough so far for cursor positions.

Task-number: QTBUG-11969
Reviewed-by: Eskil
(cherry picked from commit 99fd5825dfb4d50cff93165995701a65b7a8e4ed)

0 files changed, 0 insertions, 0 deletions