For wxImage having both mask and alpha channel (it is technically possible), mask cannot be converted to alpha values and in this case resulting wxBitmap will also have both mask and alpha channel.
Due to lack of support for horizontal scrolling in the native control,
scrolling it was implementing by offsetting the entire control window.
However this didn't work correctly when the window was not positioned
at the leftmost border of its parent window, as the part of it that was
scrolled off could still be visible in this case, and this is exactly
what happened when the native header was used in wxGrid: scrolling it
overwrote the corner part of wxGrid.
Fix this by embedding the actual native control inside an outer wxWindow,
to ensure that the scrolled off part is clipped by the parent window.
Note that this commit is best viewed with "git show --color-moved" as
most of the code was just moved from the header into the implementation
file and is not really new.
Override wxHeaderColumn::GetMinWidth() to return the actual minimum
width instead of just returning 0.
Add a unit test verifying that this works as intended.
Drag-resizing the columns didn't work correctly when using the native
header and scrolling it horizontally, as the wrong offset was used in
this case.
Fix the offset in wxGrid code and add a unit test checking that this
works as intended (at least under MSW, as wxUIActionSimulator just
doesn't work reliably enough to test for this under the other platforms,
and, besides, only MSW has the native header control implementation
anyhow).
If it is not initialised, getting the screen rectangle will fail, so
don't even try doing it, but just return wxNOT_FOUND instead, so the
main display will be used -- this is the best we can do if the window
hasn't been created yet, as we don't know on which display it will
appear.
Closes https://github.com/wxWidgets/wxWidgets/pull/1527Closes#18481.
The changes of 5873ee7e4a completely broke
AUI layout as wxAUI code relies on Layout() still performing the layout
even when GetAutoLayout() returns false, but the new wxTLW::Layout()
didn't do anything in this case.
Fix the problem by checking whether we have a sizer or constraints in
this function instead of using GetAutoLayout(), which is supposed to
only be used by wxEVT_SIZE handler to determine if Layout() should be
called in the first place, but not by Layout() itself.
Closes#18486.
