Fix Maximized frameless window painting wrong with WS_THICKFRAME

In Qt versions greater than 6.4.2, when using Qt:FramelessWindowHint and
WS_THICKFRAME simultaneously, and handling the WM_NCCALCSIZE message to
draw a frameless window, the right and bottom sides may extend beyond
the drawable boundaries.

This is because in the previous commits, the calculation for margins was
skipped for windows with Qt:FramelessWindowHint set. This is correct for
non-maximized windows. However, when a window is maximized on Windows,
its actual size is slightly larger than the drawable area to avoid users
from dragging the border to resize the window. When window was maximized
, the code for calculating geometry should remove the margins instead of
skipping its calculation.

The fixed code determines whether to skip the calculation of margins and
frame by checking whether the window is maximized during the calculation
[ChangeLog][QPA][Windows] Adding a check for the maximized state of the
window during the calculation of margins. Margins calculation will not
be skipped for maximized windows.

Task-number: QTBUG-120196
Pick-to: 6.7 6.6 6.5
Change-Id: I63c8dbc8f65ff28cc581be261acfd3f675b027c4
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

0 files changed, 0 insertions, 0 deletions