Comment 5 for bug 1658823

Not reproduced with Eduard's MSYS2 builds from
 http://download.tuxfamily.org/inkscape/win64/
which use a more recent stable GTK+ 3.22 build.

For GTK+ 3.19.6 as currently provided by inkscape-devlibs64, a workaround for the issue as described for the XML Editor (textbox for attribute value not accessible) is to disable the auto-hiding overlay scrollbars. In the terminal window (Command Prompt aka DOS), set this environment variable:

inkscape>set GTK_OVERLAY_SCROLLING=0

inkscape>inkscape

AFAICS this will force a minimal height (probably the minimal length of the vertical scrollbar slider) for the textbox at the bottom right of the XML Editor, and thus make it visible without having to resize the dialog's panes (I haven't found a workaround for the pane resizing issue described in comment 3 yet - apart from hoping for an update of GTK3 in inkscape-devlibs64).