102b5301 introduced an issue on GTK where the column width was
incorrect when read, then was set incorrectly (a known problem
on GTK tree views). We should only apply that fix on OSX.
Fixes https://gitlab.com/kicad/code/kicad/issues/3720
* Move column width manipulation into the lib tree adapter
* Fix issue with GTK where if someone types too fast, the part
column gets 0 width.
Fixes: lp:1841584
* https://bugs.launchpad.net/kicad/+bug/1841584
When filtering, we update the width of the displayed column to ensure
the full text is visible to the user. Check is rough, based on line
width (doesn't completely account for differing char widths) but is
sufficient for the approximate difference
Fixes: lp:1815401
* https://bugs.launchpad.net/kicad/+bug/1815401
Fixes: lp:1788495
* https://bugs.launchpad.net/kicad/+bug/1788495
Drop all uses of wxRAISED_BORDER and wxSUNKEN_BORDER from dialogs and
panels used in main frame windows.
Drop use of wxSP_3DSASH options on all wxSplitterWindow definitions.
Minor dialog alignment and spacing fixes.