Improve robustness of QS60Style when creating native theme bitmaps

Three robustness improvements:
a) When doing a compatibility check for a style part, make check
always pass if the part is supported by all platform versions.
b) Re-attempt icon creation without a mask, if creation with
mask fails.
c) Paint theme background with white (instead of just giving up)
in error cases.

Task-number: QTBUG-21119
Reviewed-by: Miikka Heikkinen

0 files changed, 0 insertions, 0 deletions