This is not needed any longer after the changes of the last commit.
Note that the (still existent) public wxGetDisplaySizeMM() didn't use
this function, but used PPI instead.
Don't try computing the PPI ourselves from the physical size and the
number of pixels, this doesn't work and nobody else does it like this.
Just assume that we're using standard PPI by default and use
toolkit-specific functions for the platforms with support for high DPI.
This is conceptually the same as the ratio of the current DPI to the
standard one, but can be implemented more directly for wxGTK3 and wxOSX
(although the latter doesn't implement it yet).
Just scale the standard PPI by the scaling factor instead of trying to
compute the actual physical PPI, as the latter is not useful and is
incompatible with the value used by all the other applications.
This was disabled, but only didn't work because wxSlider used tiny size
in wxGTK by default previously. After correcting this in aa2d159e8c (Use
more reasonable length for wxSlider in wxGTK by default, 2020-08-04),
the unit test passes with wxGTK too and can be reenabled.
Closes https://github.com/wxWidgets/wxWidgets/pull/1992
Use the same 100 DIPs as in wxMSW, to make the default behaviour more
useful.
Also update documentation to explain which size component should, and
should not, be specified when creating the slider.
Closes https://github.com/wxWidgets/wxWidgets/pull/2012
Relying on "check-resize" to detect when a "size-allocate" is in progess is
insufficient, resulting in the possibility of a window ending up with the wrong
size or position after inital layout. Using our existing "size-allocate"
handlers should be enough to detect the cases we care about.
See #18865
A virtual wxListCtrl with wxLC_HRULES which wasn't fully visible on
screen, i.e. didn't fit into the visible area of its parent window
(which included the case when the parent was a wxScrolledWindow, for
which it is normal and expected not to be able to fit all of its
children) got into an infinite repaint loop because of a RefreshRect()
call inside wxListCtrl::OnPaint().
Fix this by avoiding to call RefreshRect() added in 374db28747 (Fix
wxMSW ListCtrl drawing of horizontal rules for new items, 2016-05-04),
unless the current clipping rectangle is less than the actually
effective visible width and not the full client width, which can be much
bigger.
This still doesn't ensure that we don't enter into an infinite recursion
here, so it would be even better to call RefreshRect() at most once
before the next control change, but it's not clear when exactly this
"already refreshed" flag would need to be reset.
See #17158.
Closes#18850.
