Fix memory leak when not finishing iteration started by wxFindFirstFile().

Memory allocated by wxFindFirstFile() was only freed when no more files could
be found by wxFindNextFile(), resulting in a memory leak if the iteration was
never finished.

Closes #4631.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75975 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Document interaction of wxSplitterWindow gravity with initial size.

Document the somewhat counter intuitive (but difficult to change) behaviour of
the splitter when both sash position and gravity are set.

See #15996.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75976 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Expose ScintillaWX DoDragEnter() and DoDragLeave() methods.

These methods are needed to allow implementing alternative wxDropTargets, in
addition to the already public DoDragOver().

Closes #16010.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75977 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Allow retrieving wxPG_FLOAT_PRECISION and not just setting it.

It was possible to call SetAttribute() to change this attribute value but not
to get it back. Override DoGetAttribute() to also allow the latter.

See #15625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75978 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use symbolic attributes names in wxPropertyGrid code.

No real changes, just use constants instead of hardcoding their values.

See #15625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75979 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix several rounding problems with float values in wxPropertyGrid.

Loss of precision when converting floating point numbers to text and back
could result in several problems, notably comparing a valid value with the
minimum could fail after a round trip through wxSpinCtrl.

Fix this by using a specialization of NumericValidation() handling floating
point values specially and correctly.

Closes #15625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75980 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775